Here is info for you ............
Nokia 1100
Nokia BL-5C : Li-ion Battery 850mAh
Newer model
BL-5C / BL-5CA
Original Li-Ion-battery 1020mAh Nokia 1100/2300
Dimensions
The Nokia 6030 BL-5C battery has a flat rectangular shape and weighs 2 oz.
It is 53.05 mm tall, 33.84 mm wide and 5.62 mm deep.
Compatibility
The Nokia 6300 battery may also serve as a replacement part for the Nokia BL-5CA, BL-5CB and BR-5C batteries.
The same battery will also power Nokia models 1100, 1112, 1208, 2330, 2730, 3100,
3660, 5130, 6086, 6230, 6555, 6600, 6670, 6820, 6822, 7610, C1-01, C2-01, N70, N71, N72 and X2-01.
Mobile Phone Battery Dangerous Usages: [Notice]
Don't short-circuit. A short-circuit may cause severe damage to the battery.
Don't short circuit terminal or store your battery pack with metal parts.
Don't drop, hit or otherwise abuse the battery pack as this may result in the exposure of the cell contents, which are corrosive.
Don't expose the battery to moisture or rain.
It is normal to get warm when charging or normal use.
If it is getting too hot, there may be a problem with the device and qualified personnel should check it.
how charge directly a BL-5C using ACP-12X?
Using mobile phone as li-ion charger?
All about your Nokia Battery.
Want to know the pin details of Nokia Li-Ion BL-5C battery & IC required to charge Battery
Li-Ion Charger Using Max 1555 - diyAudio