Here I will tell you the way to extend your Li-ion battery.
1. Keep your batteries at room temperature
2. Think about getting a high-capacity lithium-ion battery, rather than carrying a spare
3. Allow partial discharges and avoid full ones (usually)
4. Avoid completely discharging lithium-ion batteries
5. For extended storage, discharge a lithium-ion battery to about 40 percent and store it in a cool place