Warning! To recharge the battery, use only a battery charger suitable for lithium batteries. It is advisable to recharge the batteries using the cell balancing system. Avoid draining the battery under 3 volts per cell to avoid damaging the battery. In fact, under 3 volts chemical reactions can occur that can ruin the ability of cells to store a future charge. To prevent the battery cells from discharging excessively, it is advisable to use control devices that alert you with an alarm sound when the voltage is too low. Remember that during battery storage, it must be charged or partially charged, avoiding to completely discharge the battery to avoid damaging it. The optimal temperature during storage is 12 degrees Celsius. Disconnect the battery after each use.