Panasonic KX-TGP600 Operating Instructions Manual page 12

Important Information
Important Notice Concerning the Correct Use and Charging of Ni-MH Batteries
Batteries, due to their construction, undergo some wear and tear. The lifetime of batteries also depends
on correct maintenance. Charging and discharging are the most important factors. You should take
notice of the following to maintain the life of the batteries as long as possible.
Ni-MH batteries have a kind of memory, the "memory effect". If fully charged batteries are used several
times only for 15 minutes in the handset and then recharged, the capacity of the batteries will be reduced
to 15 minutes due to the memory effect. Therefore you should discharge the batteries completely, i.e. use
them in the handset until the battery level indicator displays as empty (" "). Then recharge them as
described in the manual. After the memory effect has occurred, it is possible to achieve almost complete
capacity of the Ni-MH batteries by charging and discharging several times one after another.
Ni-MH batteries can also self-discharge. This self-discharge depends on the ambient temperature. At
temperatures under 0 °C (32 °F), the self-discharge will be the lowest. High humidity and high
temperatures support the self-discharge. Also long-term storage will lead to self-discharge.
CAUTION
RISK OF EXPLOSION IF BATTERIES ARE REPLACED BY AN INCORRECT TYPE. DISPOSE OF
USED BATTERIES ACCORDING TO THE INSTRUCTIONS.
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