This depends on the system. For example, a NiCd rechargeable battery
must always have been completely discharged each time before it is recharged.
This is best done by using a charger with a discharge function. All rechargeable
batteries benefit from occasional "cycling": The rechargeable batteries are
discharged and recharged several times in succession. This restores the full
capacity that had been lost as a result of the memory effect.
No. Charging takes around 1-2 hours with a quick-charger, as opposed to more than
10 hours charging time for normal chargers. The relatively high current of the
quick-charger requires an especially reliable form of switching off once the battery
has been fully charged.
How long should I leave my rechargeable batteries in the charger?
With modern, electronically controlled chargers there is no danger if you leave the
batteries in the device for several days, for example. They switch off when the battery
is fully charged or switch over to a lower current maintenance rating. Rechargeable
batteries can be damaged or destroyed if they are not taken out in time from a charger
that does not have reliable switching off. The maximum charging duration can be calculated
as follows, given that there had previously been a full discharge:
NiCd batteries:
(capacity of the battery x 1.4) : Charging current of the charger
NiMH batteries:
(capacity of the battery x 1.5) : Charging current of the charger
In what charging state are rechargeable batteries supplied?
Rechargeable batteries are in principle charged during production to be able to check
if they are functioning properly. The battery loses its charge, depending on how much
time elapses from the production of a cell until it is sold at the shop. The rechargeable
battery must be charged before it is used for the first time. NiCd rechargeable batteries
must first be discharged so that a memory effect does not arise.
That depends on the type of charger used: The greater the charging current of the charger,
the more quickly will the battery be fully recharged. Normal charging takes around 10 to
16 hours (typical "overnight charging"). Quck0charging can be done in around 2 to 3 hours,
ultra-fast chargers can even recharge a battery within around 30 minutes. The exact details
can be found in the instructions for use of the relevant chargers.
Should you take the batteries out of the device if it is not going to be used for a longer period?
Yes. There can still be a small current flowing in devices that have been switched off , and this can cause
a deep discharge over a longer period of time that damages the battery and, in extreme cases, destroys it.
