Your new PANASONIC HDC-TM40 battery comes in a discharged condition and must be charged before use. Upon initial use (or after prolonged storage period) the battery may require two to three charge/discharge cycles before achieving maximum capacity.
When charging your PANASONIC HDC-TM40 battery for the first time your charging device may indicate that charging is complete after just 10 or 15 minutes. This is a normal phenomenon with rechargeable batteries. Simply remove the battery from the charging device and repeat the charging procedure.
It is important to condition (fully discharge and then fully charge) the PANASONIC HDC-TM40 battery every two to three weeks. Failure to do so may significantly shorten the battery's life (this does not apply to Li-Ion batteries, which do not require conditioning). To discharge, simply run your device under the battery's power until it shuts down or until you get a low battery warning. Then recharge the battery as instructed in your user's manual.
If the PANASONIC HDC-TM40 battery will not be in use for a month or longer, it is recommended that it be removed from the device and stored in a cool, dry, clean place.
It is normal for a HDC-TM40 battery to become warm during charging and discharging.
A charged PANASONIC HDC-TM40 battery will eventually lose its charge if unused. It may therefore be necessary to recharge the battery after a storage period.