The new lamp Power Kraftwerk 3897 is the lamp emergency led light with diffused light, long range (200 metres) that will allow you to not worry about the battery life.
The new lamp is in fact equipped with a lithium-ion battery (Li-Ion 3.7 V) which not only has a longer life than normal batteries, but does not suffer damage if left charging for a long time.
You can leave the lamp still attached to its charger without damaging it!