Li-Po 850mAh 7.4V 20C Battery

Lithium-Ion-Polymer (LiPo) packs are successors
to the known Lithium-Ion (LiIon) packs. The basic advantage of LiPo is
undoubtedly the ratio of capacity to size. The packs are of very small size
whilst maintaining a very large electric efficiency, which allows for choosing
an appropriate pack for practically every AEG replica. Do not feature memory
effect. Can be charged very frequently, without the need to be fully
discharged. Frequent charging is beneficial for every type of a battery.

It is crucial to remember not to discharge a
LiPo pack to a level of less than 3V per cell and not to overcharge over
4,2V per cell. Another advantage of LiPo packs is a small percentage rate
of self-discharge. Unused pack will lose approximately 3-5% of energy per
month. It is important to pay attention to an unused pack as there is a risk
that as a result of not being used over a prolonged period of time it can be
discharged beneath the acceptable minimal value (3V per cell) and inadvertent
chemical reactions may occur, which lead to a deterioration of the pack’s
properties including a permanent damage and, in extreme cases, fire. Unused
LiPo pack should be charged to an average of 70%.

Properly used, a LiPo pack has an
exploitation period of on average 500-700 cycles. An important factor is the
temperature that LiPo packs can work in. In contrast to other batteries, LiPo
cells perform well in low temperatures. However, they should be charged in room
temperature. In order to maintain the good condition of LiPo batteries it is
required to balance them during charging with a service connector, which most
LiPo packs have (a good LiPo charger features an in-built balancer).

Usage of Li-Po
Batteries (PDF)