The operating temperature range is -20°C to +60°C, though it is important to note that the battery charge controller is designed such that the battery will not be charged when the temperature falls from 10°C to 5°C, similarly when the temperature rises from 40°C to 45°C charging will again be stopped. It is possible to use the unit between -20°C and 0°C, and also between 45°C to 60°C given power is available from the battery or externally; only if it is used from the battery and the charge level is depleted, it will stop operating.
Do not use the wrong battery type in charger based applications. Only Lithium Ion cells can be charged using the built-in charger.
Do not attempt to charge Primary (non-rechargeable) batteries. If Primary cells are used, it is essential that no power is connected into the unit via the 5V power input. The Primary battery has to be connected to the battery connection header only..