LiPo 7.4V 1200 mAh 20C Valken
Energy Stick Battery Pack

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. They 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. An 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. An
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 inbuilt balancer).

Usage of Li-Po Batteries (PDF)