NICD——Nickel Cadminum rechargeable battery size:AAA,AA,A,SC,C,D,F capacity range:100mAh-10000mAh Application： 1) Emergency exit signs 2) Torches, hand lamps 3) Telecommunication devices, toys, electronic devices, home appliances. 4) power tool, vacuum cleaner, model plane, toy, electrical bicycle,etc..