Charge battery with good quality Lithium Polymer charger. A poor quality charger can be dangerous.
Set voltage and current correctly (failure to do so can cause fire).
Please check cell voltage after the first charge.
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)
Do not discharge battery to a level below 3V per cell under load. Deep discharge below 3V per cell can deteriorate battery performance.
Use caution to avoid puncture of the cell. Puncture of cells may cause a fire.
Charging the battery every 2 months to keepit fresh if you don't use it.