Proper battery care for R/C Lipo (lithium polymer) batteries is essential. Unlike other batteries, lipos require a specific routine of charging and discharging to ensure proper performance and longevity. In addition, lipos designed for R/C use have had all safety mechanisms removed to achieve the incredible performance that your R/C helicopter requires.
Every lipo battery is made up of individual cells from anywhere between 1 and 8 cells per battery. These cells are always rated at 3.7 volts. So a 2 cell battery will have a rated voltage of 7.4 volts, a 3 cell lipo would be rated at 11.1 volts and so on.
What most people do not know, is that all of the available power in a lipo battery is contained in the top 1 volt of power. In other words a single cell 3.7 volt lipo battery would be fully charged at 4.2 volts (max full voltage) and that same battery would be totally dead at 3.2 volts. As a matter of fact, if you were to let that battery ever drop below 2.9 volts, you would have permanently damaged the battery and it may no longer have the ability to be recharged or used ever again.
In order to avoid this happening to your lipo batteries try these suggestions:
Even though all lipo chargers say they also balance, they do not perform nearly as well balancing as they do charging. We highly recommend getting an additional battery balancer like the battery medic to balance your battery.