Caring for Battery
1) Charge battery with good quality Lithium Polymer charger. A poor quality charger can be dangerous.
2) Set voltage and current correctly (failure to do so can cause fire).
3) Please check cell voltage after the first charge.
Example 1-Cell: 4.2V (4.15 to 4.22)
2-Cell: 8.4V (8.32 to 8.44)
3-Cell: 12.6V (12.48 to 12.66)
4-Cell: 16.8V (16.64 to 16.88)
5-Cell: 18.5V (18.30 to 18.60)
4)
Do not discharge battery to a level below 3V per cell under load. Deep discharge below 3V per cell can deteriorate
battery performance.
5) Use caution to avoid puncture of the cell. Puncture of cells may cause a fire.
this comes from thunder power Charging & Safety Pamphlet
http://www.thunderpower-batteries.co.../charging.html