Permobil Explorer Mini User Manual page 65

Batteries lose capacity as they age. The length of their service life is affected
by three things: how much power that is left in them before they are charged,
how often they are charged, and how often they become completely
discharged.
A good rule of thumb is to charge the batteries at the end of each day to
prevent that they become completely discharged. You can charge the
Explorer Mini when it is not in use.
WARNING! Do not replace batteries
WARNING! Only use supplied battery charger
WARNING! Charging conditions to avoid the risk of fire
or explosion
WARNING! Risk for overheating, sparks or short-circuit
WARNING! Do not charge the Explorer Mini outdoors
CAUTION! Only use supplied cable to charger socket
Handling and driving - 65