Accessories; A Few Practical Rules For Accessory Operation - Nokia 6160 Owner's Manual

6. Accessories

A few practical rules for accessory operation:

Use only batteries, chargers and accessories approved by the
phone manufacturer. The use of any other types will invalidate
any approval or warranty applying to the phone, and may be
dangerous.
See page 8 for important battery usage information.
Batteries
These charging times are approximate.