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One Of Three People Found The Following Review Helpful:

How to Care and Maintenance Your New Replacement PANASONIC CGA-DU21 Battery?

• Usually new PANASONIC CGA-DU21 battery comes in a discharged condition and it must be charged before use (refer to your camcorder manual for charging instructions). Upon initial use (or after a prolonged storage period) the PANASONIC battery CGA-DU21 may require two to three charge/discharge cycles before achieving maximum capacity.

• Use a full charge cycle before recharging. All camcorder batteries in our site are Li-Ion batteries, so, they do not have memory which you might find in NiCad batteries. However, each chemistry has a limited number of charge cycles, so use a full charge cycle before re-charging to maximize your battery usage. When charging this PANASONIC CGA-DU21 notebook battery for the first time your camcorder may indicate that charging is complete after just 10 or 15 minutes. Don’t worry, this is normal with rechargeable batteries. Just simply remove the PANASONIC CGA-DU21 battery from the camcorder and repeat the charging procedure.

• Try To avoid over-charging, especially, do not let your camcorder battery over discharge. It is normal for PANASONIC CGA-DU21 battery to become warm when charge and use you battery. The battery exhaust much faster under the high temperature, you should avoid using your camcorder battery in shady, cool place. Hit the battery, and other acts will also accelerate depletion of battery. So, pay attention to your battery as much as possible.

• If you don't use your PANASONIC CGA-DU21 camcorder batteries for 1 month or longer, you should remove the battery from your notebook, make sure leave your battery power about 40%, stored in a shade, cool, dry place away from heat, metal objects and direct sunlight, but not in the refrigerator. It’s objected strongly store your PANASONIC CGA-DU21 camcorder battery for over three months without any using. A charged PANASONIC camcorder battery will eventually loses its charge if unused. It may therefore be necessary to recharge the battery after a storage period.