The tools battery is unique; the tool's power does not diminish as the battery power runs low. There is full uniform power all through the battery runtime.
Lithium cells must be charged very differently than NiCD or NiMH cells. Firstly they require a special charger specifically designed to charge lithium cells, NEVER use NiCD or NIMH only chargers on LiPo batteries! You must use a Lithium Ion or Lithium Polymer charger that is designed to handle the number of cells you are trying to charge. Charging Lithium cells is the most hazardous part of using lithium batteries. EXTREME care must be taken when charging them to avoid damaging the cells or worse causing them to catch fire. It is important to set your charger to the correct voltage or cell count. There have been fires directly caused by eddy stock so PLEASE BE RESPONSIBLE when charging lithium batteries.
An acid based battery should be stored at full charge. Nickel and Lithium based power cobalt mining copyright cells should be stored at half charge or charge. This will help keep them from using capacity over time, and you will see a better performance from them when you do use them.
One of the key decisions is to determine when to do your purchase. It's a decisions you should base on the long term charts. The "golden" rule is to buy the dips (they always come) and avoid buying at the peaks.
Some years lithium mines ontario had more than one Privy mark coin issued for example had a Fireworks an Expo Hanover and a Year of the Dragon. There has been a theme of the Chinese Zodiac series and covered all 12 months.
Never discharge your LiPo cells to less than 3.3volts per cell, not the total pack voltage. Most ESC's today will do a soft cut-off at 3.3volts per cell and a hard cut-off at 3.0volts per cell. However some will not give you and warning. Best advice is to fly with a timer and monitor the voltage and adjust your flying time if needs be.
The bottom line, be gentle to your lithium-ion batteries. If you excessively charge the battery, with high voltages, and heavy load conditions, it will shorten your battery's life. It's best to charge at a slower rate.