Do not freeze the battery: Lithium batteries should never be exposed to temperatures below -10°C for an extended period of time.
Do not overheat the batteries: Overheating the battery above +50°C is as harmful to the battery as hypothermia. So place the device in the shade if possible, and be careful about leaving it in the car at the height of summer.
Do not short the battery: Never make a conductive connection between the positive (red) and negative (black) battery terminals. This will inevitably damage the battery and pose a risk to your health.