This is why I ordered the Patona Battery Charger with two battery packs and did not regret this purchase.
Charging can be done via network connection, also is an adapter for charging in the car's cigarette lighter in. In addition, both a USB and a Micro USB port in charging housing are integrated. Thus, one is actually prepared for all eventualities.
Charging a battery is indicated by a pilot light. Solange is charged, the LED lights as follows: Red = charging; Orange = almost full; Green = battery fully charged. Both Patona lithium-ion battery packs with 950 mAh are doing - not warm at least for me (network connection). The genuine Panasonic battery (895 mAh) is also served and charged by the complications. All batteries raced well into the charging cradle. Leaving you a battery in the connected charger manufacturer is then lt. Automatically switched to trickle charge.
Both replacement batteries are easily recognized by the camera. The term of the replacement battery is felt just as good as the original.
With one or two spare batteries is you then definitely on the safe side and must not be afraid that one go out of power!
Especially for the owner of a TZ31, which use the GPS features often, the purchase is actually indispensable. From my side, a very clear and unconditional recommendation to buy!