You need to charge the rechargeable battery when the top-left and bottom-right signaling segments light up red. Wait until the rechargeable battery has reached room temperature again before charging it.
If the battery feels pleasantly warm to the touch, this is normal. However, if the rechargeable battery is warmer than this, remove it immediately – there is a risk of fire!
Leaking liquid, deformation, damage to the battery housing, or excessive heat are all signs that the rechargeable battery is damaged. In this case, remove the defective battery immediately and dispose of it correctly. Do not send the defective rechargeable battery back to ekey biometric systems GmbH under any circumstances. How should I dispose of the rechargeable battery for the ‘ekey
The rechargeable battery needs to be charged approx. every 6 months. High temperature fluctuations cause a loss of energy in the battery and can therefore have a negative effect on the function of your fingerprint scanner. Wait until the rechargeable battery has reached room temperature again before charging it.