Jewellery & Watch

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Jewellery & Watch Suppliers and Manufacturers

Chung Pak Battery Works Ltd

The lithium battery features an extended shelf life and low-temperature operations. The constant voltage provides a stable source of power supply. Keep your electronics up and running with this lithium battery. 	 Voltage: 3V x 5. 	 Available in different designs.&nbsp;  

Lithium Manganese Dioxide Button Cell

Golden Power Corp (HK) Ltd

Lithium Button Cells CR2025/CR2032 Applicable Products powered for: LaryngoscopeInsulin Delivery DeviceGlucose Meter

Lithium Button Cells

Firstsing Co Ltd

Heart Rate Sensor Bluetooth NFC Smart Watch PRODUCT INTRODUCTION Operating system, processor, memory characteristics The operating system Android 10 Processor type Spreadtrum SL8541E/SL8521E (low configuration) Quad core ARM Å CortexTM A53 MP processor, up to 1.4GHz Graphics processor GPU Mali 820 MP1 @ 680MH Power management PMU support WIFI+Bluetooth WIFI: 2.4G 802.11b g n BT: v2.1+EDR V4.2 low energy Store 533 MHz LPDDR3 eMCP: 1G+8G 2G+16G 4G+64G\ Positioning support GPS/Beidou/Granas, support WIFI2.4G, support BT UIM card support Display screen 1.96 inch resolution: 320 × 386 1.95 resolution: 240 * 284 (low configuration) Battery 700MAH polymer lithium battery E-Sim card support Touch TOUCH PANEL to support 2G network GSM B2/B3/B5/B8 3G network WCDMA: B1/B2/B5/B8 4G Network LTE_ FDD: B1/B2/B3/B5/B7/B8/B20LTE TDD: B38/39/40/41 (100MHz)  function Antenna External FPC/LDS Speaker Receiver independent earpiece/speaker 2-in-1 Motor support MIC Welding Line MIC Wireless technology WIFI support NFC support Bluetooth v2.1+EDR V4.2 low energy Torch not support Accelerator sensor support Camera support 30W Step by step support Heart rate sensor support Barometer and altimeter support Compass support Thermometer not supported Video format (supports high-definition 1080P) support Audio formats support Image formats JPG, JPEG, BMP Video decoding formats JPG, JPEG, BMP Battery type LI-ON 700MAH polymer lithium battery Power adapter input: AC100-240V.50-60HZ, output: USB5V 1A External I/O ports USB jack Pogo PIN 4pin USB SIM card single card NANO SIM card (supports flip card holder) Heart rate support, extended with the same BTB connector IO interface connector expansion, with functions such as data, charging, downloading, SIM card support for air pressure and intelligent health management, and power on button Sidekey Power key Return key  consumption Working time 1-2 days Standby time 3-5 days Charging time 3-5 days Continuous call duration of approximately 4 hours  Buildin APP Software support Clock support Main interface support Middle layer support Active exercise recording (hiking, running, cycling, mountaineering, swimming) support SMS support Telephone support Address book support Setting Support Step by step support Calculator support Browser support Recorder support Calendar support Email Support Search Support Video support Library support Download Support Music support Alarm clock support Camera support Heart rate support Compass support Weather support Application Market Support OTA online upgrade support Input method support Bluetooth connection for mobile phones, phone calls, message push support Mobile sync app support Third party applications: WeChat, Alipay, QQ and other support 

Heart Rate Sensor Bluetooth NFC Smart Watch

Children's smart phone watch, video call positioning for primary and secondary school students, WiFi card insertion, full network access, electronic watch bracelet    Newly upgraded and stunning throughout the venue  4G All Network Video Call  Swimming grade waterproof/- key SOS alarm/extended battery life    call  High definition video call  Supports 4G traffic/WiFi video calls  360 PHOTO  NEW 2021  Seeing a child's true appearance anytime and anywhere from zero distance  Face to face chat, watch and phone ready at any time  Video call voice chat    security  -Key alarm  Be a guardian of children's safety  Long press and hold for 4 seconds - key to send location and emergency call  Keep you informed of your baby's details in a timely manner  Long press for 4 seconds  One click for help    Worth buying. Nine reasons  Video call  4G full network connectivity  Jiuzhong AI positioning  Alipay wallet  _ Prohibited during class  Anti unfamiliar phone calls  Extra Long Range  IPX67 waterproof  APP remote monitoring    payment  Scan QR code for small change payment  Limit/Audit Form  Cultivate children's financial management concepts from an early age, with limits available,  Mobile account verification for better protection of payment security    intelligent  AI intelligent robot  A tutor that children carry with them  Built in intelligent robot, asking for weather and knowledge  Search for English words and answer them immediately  Shuai, it's cloudy today, from 28 to 33 degrees  What is Shuai Murphy's Law?  What's the weather like today?  The English word for handsome life is Life  How to say the English of life?  What is the second tallest mountain in the world?  Who is Archimedes?  It's Georgery    performance  Kernel performance optimization  Chip upgrade,  Quick positioning  2021 New AKQ8 chip positioning technology, making positioning faster and more stable  More secure. Kernel optimization, more accurate positioning, not just talking about    Endurance  Battery upgrade  Built in 1280 milliampere polymer lithium battery  Adopting intelligent energy-saving chips combined with large capacity batteries  Longer endurance, more comfortable, safe, and long-lasting protection for use    network  4G full network connectivity  Fully support China Mobile Unicom Telecom  Built in SIM card slot, supporting China Mobile, China Unicom, and Telecom  Even if you forget your phone, you can always be online when answering and making calls   

Children's smart phone watch, video call positioning for primary and secondary school students, WiFi card insertion, full network access, electronic watch bracelet

   The button cell has a low-drain design for continuous use over long periods of time.   It is made of mercury-free material for safe application. This button cell is the optimal power source for a variety of electronic devices.   Voltage: 1.5V x 10.   Available in different designs.&nbsp;   Size:11.6 x 4.2mm  

0% Mercury Alkaline Manganese Dioxide Button Cell

ULTMOST ELECTRONIC LTD

Digital Memo Talking Alarm Watch, Supports Hourly Report, with 10-inch Recording Time	Ten seconds flash recorder is added in for you to make a voice note of things such like a parking lot number, long-lost friend's phone number, grocery to buy or any other must-not-forget memo	An alarm watch with snooze function	With clear talking function	Supports hourly report	Built with 10-second voice recorder	Powered by CR2025 Lithium battery	With unisex design

Digital Memo Talking Alarm Watch

Novelty LED Watch for Men, Blue Wonder LED, with 4 Level Brightness Control
<ul>
	<li>Mirror face</li>
	<li>Mysterious blue LED Displays time, date and year</li>
	<li>4-level brightness control</li>
	<li>12/24hrs format selectable</li>
	<li>ABS case, comfortable PU band</li>
	<li>Low power consumption</li>
	<li>Battery: CR2032 Lithium x 1 (included)</li>
</ul>


Novelty LED Watch for Men

Linkco Int'l Ltd

Function Description as below 	 Round Shaped Smart Watches with 1.3 inch large touch control display 	 Master Chip: nRF52832 	 1.3 inch large dial plate with touch function 	 IP67 waterproof 	 Large capacity battery and long standby 	 Built in 180mAh Lithium battery 	 4.0BLE(low power consumption) 	 Heart rate monitor 	 Blood pressure monitor 	 Sports pedometer 	 Information synchronization  

Smart watches with 1.3" touch control display

Smart bracelet 	 0.88inch OLED display 	 Unique design 	 3.85mAH lithium battery 	 IP67 waterproof 	 Accurate heart rate test 	 Touch function 	 Pedometer / Distance / Calories 	 Calling / SMS reminder / Notification push (WhatsApp / Skype / Twitter / Facebook etc.) / Remote control music / Shake to take photo  

Smart Bracelet

Cheertone (HK) Ind'l Co Ltd

 New Kids Digital Smart Watch CT-W11 
Specification 	 1.54&quot; IPS HD touch screen 	 Camera: 0.3MP, JPEG ( 1&nbsp; camera) 	 8 amazing digital and 8 analog clock face 	 Strap: Silicone; Exterior: ABS&nbsp; Plastic&nbsp;&nbsp; 	 Memory: 32MB + 128MB 	 Can support upload and download 	 Build in Speaker 	 Battery: 400mAh lithium ion battery 	 Gender: Unisex 	 Major Material: ABS 	 Age Group: 5-11 Years  Functions: 	 Take photos 	 Music player 	 Voice record 	 Photo album 	 Build-in 5 games 	 Pedometer 	 Torch 	 Alarm 	 Watch faces 	 Timer 	 Stopwatch 	 Calendar 	 Calculator 	 Settings  

Kids Digital Smart Watch

Specification: CPU: RTL8762C G-Sensor: STK8321 Display: 1.3 inch IPS (240*240) Bluetooth: 5.0 Sync Control mode: Single touch Battery: Polymer lithium battery Battery life: 15-20 days Battery capacity: 200mAh IP grade: IP68 waterproof Memory: 160KB RAM + 64M ROM Data storage: Local and cloud server Compatible Devices: Android 4.4 &amp; IOS 9.0 and above Charging mode: Magnetic type Charge time: About 1~2 hours Case material Zinc alloy Strap material: Silicon APP language: Chinese, traditional Chinese, English, Japanese, Korean, German, Russian, Spanish, Italian, French, Portuguese 11 languages. Box Inside 1 x smart band, 1 x user manual, 1 x charger with cable, 1 x gift box Packing Size: Standard Carton Packing: 50pcs each carton Weight: 6.5kg Carton Size: 38*32*17cm Color option: Black,Gray  Main functions: 24hrs Heart rate and blood pressure monitoring Ten previous message record checking,Remote control Photograph Activity tracker (Pedometer, Calories, Miles), Sports model, Sleep monitor ,Call and SMS reminder 

2020 New arrival waterproof IP68 smart watch Fitness Tracker with 60 days long standby time

AC Electronic Ltd

This is a more affordable version of the Amazfit GTR, which currently sits in our round-up of the best smartwatches of all time, swapping out the 22mm leather band for a sweat-resistant silicone version and cutting down the number of sport modes from 12 to eight. It also loses the GPS, air pressure and geomagnetic sensors, but otherwise sports much the same features, including the 410mAh lithium-polymer battery and 5 ATM waterproofing. 

Amazfit GTR Lite (Black, 47mm, Global)

Pacific Rise Trading Ltd

 	 Basic Parameter 	 Product size : 24.5 x 2.1 x 1cm 	 Weight : 24g 	 Color : Black,Dark Blue, Red, Purple, Pink, customized 	 Major Function : BP monitor, Dynamic heart rate monitor,multiple-sport mode,steps,calories,sleep monitor,reminder functions,message push,turn wrist to wake up,alert. 	 Compatible with android and IOS system 	 Display Type TFT-IPS 	 Size 0.96inch 	 Battery Type : Lithium polymer battery 	 Capacity : 80mAh (around 7 days standby) 	 Cert : CE / ROHS / MSDS  

2018 Newest Smart Watch

Full Touch 1.3 Inch IPS Display Smart Watch Health and Fitness Smartwatch with Heart Rate, Sleep and blood pressure monitoring, One Size Big Round Full touch 1.3 inch IPS Display Smart Watch with high grade Genuine Leather strap Main functions: 24hrs Heart rate and blood pressure monitoring5 kinds of sport mode(outdoor Running Riding, walking, indoor running, plank, exercise)Sleep monitoring, Activity tracker (Pedometer, Calories, Miles), GPS trackCall and SMS reminder, Countdown, Stop watch, remote control taking photos etcCPU: Nordic NRF52832Display: 1.3 inch IPS (240*240)Bluetooth: 4.0 SyncControl mode: Full touchBattery: Polymer lithium batteryBattery life: 7 daysBattery capacity: 250mAhWaterproof: IP68Memory: 64KB RAM+512KB ROMData storage: Local and cloud serverCompatible Devices: Android 4.4 &amp; IOS 9.0 and aboveCharging mode: Magnetic chargerCharge time: About 1~2 hoursShell: Aluminum alloy + PlasticStrap material: TPU (Or Leather + TPU)Diameter: ￠46Band: 22mm wideAPP language: Chinese, traditional Chinese, English, Japanese, Korean, German, Russian, Spanish, Italian, French, Malay, PortugueseBox Inside: 1 x smart band, 1 x user manual, 1 x charger with cable, 1 x gift boxPacking Size:Color option: Black,Brown,Gray

Full Touch 1.3 Inch IPS Display Smart Watch Health and Fitness Smartwatch with Heart Rate, Sleep and blood pressure monitoring, One Size

Digital Talking Alarm Man's LCD Watch with Weekday Report and Brightness Control Function ABS case, PU bandDisplays and voice reports time and day of the weekSupport hourly reportwith alarm and snooze functionsPowered by CR2025 Lithium batteryA male watch design

Digital Talking Alarm Man's LCD Watch

WORLD SYMBOL TECHNOLOGY LIMITED

Functions: Bluetooth calling, heart rate detection, blood oxygen detection, blood pressure detection, time display, step counting, calories, distance, heart rate, multiple exercise modes, sleep monitoring (sleep time, sleep quality), incoming call notification, message reminder, multi-language Push, task reminder (sedentary reminder), music control, sync data to APK/APP Material: Zinc alloy shell + PC bottom shell + stainless steel strap.                Main control: RTL8763EWE Memory: 128Mb FLASH Display+TP: 1.3" IPS screen Resolution: 360*360 G+F, anti-fingerprint oil Gravity sensor: Silicon STK8321 Heart rate sensor: HX3605 Battery: polymer lithium battery 200 mAh with battery protection IC Speaker: 1508 (waterproof speaker) Microphone: TMG4015 (waterproof microphone) Waterproof grade: IP68   

smart watch

MGM Industries & Company

Inject a dose of fun to your little one on the go with this smartwatch toy. This smartwatch toy allows the little ones to imitate their smartwatch-wearing parent and kicks off hours of fun and joy thanks to a wide array of built-in features, from games to camera effects. Splashproof and sweatproof, the watch would not sweat more than your kid after playing in the summer sun.

&bull; Feature 3 fun activities, 5 games, 3 action challenges and a motion sensor.
&bull; Flaunt excellent durability.
&bull; Adequate memory for tons of pictures and videos.
&bull; Feature camera with photo effects.
&bull; Video camera and voice recorder with voice-changing effects.
&bull; Touch screen feature.
&bull; Alarm, timer and stopwatch function.
&bull; Calendar feature and a calculator.
&bull; Work out simple addition, subtraction, multiplication and division problems.
&bull; Digital and analog display.
&bull; Come with 50 plus clock face designs.
&bull; Splash and sweat proof for everyday use.
&bull; Note: please don&rsquo;t submerge or take it to shower or bath.
&bull; Rechargeable lithium ion battery.
&bull; Include a micro USB cable for uploading photos / videos and recharging battery.
&bull; Suitable for ages between 4 &ndash; 9.
&bull; Wristband can be adjusted for wrists between 137 mm to 197 mm (5.4&quot; to 7.75&quot;).

Kid Smartwatch Toy

 D10 WeChat QQ Alipay 5G All Netcom Huaqiang North S8ultra Children's Phone Card inserted Watch Smart Watch  4G full network connectivity high-definition dual camera  Children's learning phone watch  Guiding children under the age of 7 to learn  Tutoring for learning and homework at the age of 7 and above  one hundred  Gaotu  Q  Homework assistant  Gaotu Classroom  Little Ape Search Question    Dual camera  Front and rear dual cameras  Broader and more comprehensive view  Adopting a dual camera head configuration with a front camera of 500w pixels  The 800W rear camera retains true beauty  Front camera 5 megapixel  Rear camera 8 million pixels    video  High definition video call  Remote video call  Dual front and rear cameras, supporting real-time high-definition video calls  Facial recognition chip combined with high-definition camera for clear conversation with children  Visible safety, parents are more at ease!    Battery  Nine Repositioning  Accurate positioning, always in control  Accurate to the floor, supporting GPS/WIFI/LBS/A-GPS  Support indoor positioning, gyroscope and other auxiliary AI positioning    waterproof  Swimming grade waterproof  Unleash Your Water Playing Nature to the fullest  The entire body is swimming grade waterproof and can also be worn with a watch  Enjoy playing in the water with a dedicated waterproof grille  Professional microphone waterproof film, naturally waterproof    intelligent  Al Intelligent Voice  A tutor that children carry with them  Built in intelligent robot, asking for weather and knowledge  Search for English words and answer them immediately  It's cloudy today, from 28 degrees to 33 degrees  What is Murphy's Law? What is the weather like today?  The English word for life is Life  How to say the English of life?  What is the second tallest mountain in the world?  It's Mount Chogory, with a height of 8611 meters  Who is Archimedes?    Social  Downloadable new version of QQ WeChat  New Breakthrough, Android 9.0 New Version WeChat  Login without account restrictions, making phone calls anytime, anywhere  Send voice, facial expressions, and red envelopes    performance  Eight core chip  Equipped with Android 9.0  Strong Eight Core Chip and Android 9.0 Strong Alliance  Give you a flying operating experience  Assist in daily use  Improved call quality  Reduce energy consumption  Induction upgrade  Listen more clearly  Longer standby time  More accurate positioning    Combining Education with Joy  Massive Learning APP  It's something that children can't put down  Learning Telephone Watches    payment  Convenient QR code scanning payment  Support WeChat payment and Alipay payment  Support quick payment function, bind Alipay to develop wallet,  Limited, no need to carry cash    security  Face Unlock  Raise your hand and light up the screen to unlock your face  Safe and fast, quick facial unlocking    Endurance  High capacity lithium battery  Built in 1280MAH lithium battery  Using polymer lithium batteries, rejecting false charges for longer battery life  Up to 72 hours of battery life  Meeting daily needs  

D10 WeChat QQ Alipay 5G All Netcom Huaqiang North S8ultra Children's Phone Card inserted Watch Smart Watch

 	 0.96inch&nbsp;color&nbsp;display 	 Build&nbsp;in&nbsp;GPS&nbsp;function 	 150mAh&nbsp;Lithium&nbsp;battery 	 IP67&nbsp;waterproof 	 Continuous&nbsp;heart&nbsp;rate 	 Multil&nbsp;sports&nbsp;type(Running/Bicycling/Climbing&nbsp;etc) 	 Weather&nbsp;forecast&nbsp; 	 Six&nbsp;interfaces 	 Touch&nbsp;function 	 .Remote&nbsp;control&nbsp;music&nbsp;of&nbsp;mobile 	 Pedometer/Distance/Calories.Calling/SMS&nbsp;reminder 	 Notification&nbsp;push(WhatsApp/Skype/Twitter/Facebook&nbsp;etc.) 	 Shake&nbsp;to&nbsp;take&nbsp;photo  

Large Color Display Built-in GPS Smart Bracelet

Functions: Bluetooth calling, heart rate detection, blood oxygen detection, blood pressure detection, time display, step counting, calories, distance, heart rate, multiple exercise modes, sleep monitoring (sleep time, sleep quality), incoming call notification, message reminder, multi-language Push, task reminder (sedentary reminder), music control, sync data to APK/APP "Plan: Tuobu APP: Fitcloudpro Material: Zinc alloy + IML bottom case + stainless steel strap Main control: RTL8763EWE Memory Flash128MB Display+TP: 1.19"" Amoled screen Resolution 390*390 Gravity sensor: STK8321 Heart rate sensor: HX3602 Battery: polymer lithium battery 170 mAh with battery protection IC, 100% Speaker: 1506 (waterproof speaker) Microphone: TMG4015 (waterproof microphone) Waterproof grade: IP68" "Body size: 39.5*39.5*11.5mm Packaging size: 152*100*22mm Full box size: 520*320*240.8mm Product weight: 42g (including strap) Packaging weight: 158g (including packaging) Whole box weight: about 18kg" 

smart watch NX17PRO

Functions: Bluetooth calling, heart rate detection, blood oxygen detection, blood pressure detection, time display, step counting, calories, distance, heart rate, multiple exercise modes, sleep monitoring (sleep time, sleep quality), incoming call notification, message reminder, multi-language Push, task reminder (sedentary reminder), music control, sync data to APK/APP "Plan: Tuobu Material: zinc alloy shell + PC bottom shell + stainless steel strap.                Main control: RTL8763EWE Memory: 128Mb FLASH Display+TP: 1.3"" IPS screen Resolution: 360*360 G+F, anti-fingerprint oil Gravity sensor: Silicon STK8321 Heart rate sensor: HX3605 Battery: polymer lithium battery 200 mAh with battery protection IC Speaker: 1508 (waterproof speaker) Microphone: TMG4015 (waterproof microphone) Waterproof grade: IP68 " "Body size: 44.5*44.5*11.2MM Packing size: 185*106*19MM Full box size: 540*306*158mm Product weight: 73.5g (including watch strap) Packing weight: 192g (including packaging) Full box weight: 20.25kg" 

4G GPS Kids Smart Watch Smart Band Smart Wristwatch Screen: Round 1.28inch IPS Touch screen ,Pixel 240x240OS: RTOSSolution: ASR3603S,832MHz, One-core ARM Cortex-R5 processorGPS: HD8028 (More support BeiDou Galileo)GPS Accuracy: 5-15mWifi Accuracy: 30-50mLBS Accuracy: 100m above4G Video Call: By APP or VOLTEMemory: 192MB RAM+128MB ROMLocation: GPS，AGPS，LBS，WIFI2G Network: GSM B2/3/5/83G Network: WCDMA B1/2/5/84G Network LTE: B1,2,3,5,7,8,20,38,39,40,41SIM card: Nano SIM cardCalling: 3 SOS + 15 phone numberSOS: SupportG-sensor: Support (in three axis)Remote monitoring: SupportCamera: 0.3MP pixelsWaterproof level: IP67Battery: Lithium battery 500mAHDimension: 49.5×46×16.5mmAccessories: Magnetic Charge cable (Pogo pin),screen driver, SIM card tools and user manualOther features: Electronic fence (GEO),History tracking, Alarm clock, Find watch, phone book, working mode, Remote shutdown watch, support APP for Android and IOS smartphone.Color: Blue, Pink, Green

4G GPS Kids Smart Watch Smart Band Smart Wristwatch

	Digital Talking Alarm Unisex LCD Watch with Alarm/Snooze Functions and Weekday	With ABS case and PU band	Display and voice reports time/day of the week	Supports hourly report	With alarm and snooze functions	Powered by CR2025 Lithium battery	Unisex design

Digital Talking Alarm Unisex LCD Watch

Elderly positioning phone watch Vibration alarm reminder watch Accurate positioning, two-way communication, blood pressure detection, and fall alarm Prevention of loss for the elderly Positioning Watch 4G full network connectivity China Mobile New products of the season High definition video call 4G high-speed calls do not get stuck 300000 pixel front high-definition camera, connected to mobile/China Unicom 4G network Real time (multi person) video calls between watches and phones, Communication without distance, allowing you and your family to speak freely High definition video call 4G high-speed calls do not get stuck 300000 pixel front high-definition camera, connected to mobile/China Unicom 4G network Real time (multi person) video calls between watches and phones, Communication without distance, allowing you and your family to speak freely Product parameters Name: Smart Phone Watch SIM card NANO card (small card) Size 53X41X16.8MM Screen 1.30 inch IPS screen resolution 240X240 Master UIS8910FF, FDD TDD GSM Quad Band GPS+BDS/GL ONASS+WIFI+LBS Multimode localization Weight 50g Battery polymer lithium battery 700mAh Charging interface magnetic suction Compatible with Android&amp;IOS Supports all Android and IOS models, can be purchased with confidence Guardians on the wrist Heart rate detection Accurate positioning Bidirectional call Electronic fence  No typing required Voice chat anytime, anywhere Like WeChat Simple and easy to understand interaction design, easy-to-use voice chat You can also take photos and share today's news with your children This is an exclusive group chat for the whole family  Heart rate and blood pressure safety monitoring One click health detection Collecting Blood Pressure Data Using Photocapacitance Pulse Wave Tracing Method Master the health status of parents  Watch Health 4 Helpers Medication reminder Long sitting reminder Motion meter step Sleep measurement  Accurate positioning Precision upgrade Multiple positioning We adopt GPS+Beidou+LBS+WIFI Inertial gyroscope multi mode Historical trajectory recording and tracking Full day dynamic control View historical positioning for any time period at any time Keep track of the elderly's activity trajectory at all times  Electronic fence Entry and exit reminder Set up a safety fence to help the elderly get out of the set range The app will push reminder messages to keep relatives informed of updates   Big sound, big font High definition sound quality with large font design Let parents see and hear clearly, even if they cannot read You can also make phone calls to keep your company unobstructed Waterproof upgrade IP67 waterproof watch Careful design, safe and waterproof, not afraid of rain or splashing, Life waterproofing is no problem! One click binding app  Intelligent Sleep High Capacity Battery Extra long standby 700mAh polymer lithium battery, no problem after 3-4 days of use When the battery level is below 20%, the app will issue a low battery alarm Power management chip Charging protection chip 4.4V high capacity and high voltage  

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