These safety instructions must be read carefully and fully understood before attempting to use your battery.
1. let the power of the PD4410 batteries (15%) drain to 0% When you use your brand new Battery first time. And then full charge it(usually charge it full 12 hours) and let it drain to 0% again. Do this for 2~3 cycles.
2. If you have a nickel-metal hydride battery, completely drain and recharge the ZOLL PD4410 battery once a month to maximize its capacity to hold a charge.
3. Don't leave your plugged in constantly when it is not in use. If your always relies on this power, it will loose its ability to last long on its own. So always charge your when the PD4410 battery is almost dead and then unplug it from the wall.
4. If you have two or more battery pack of ZOLL PD4410, it's wise to discharge and then fully charge it on battery power once a week or so, just to keep the battery fresh conditions.
5. Keep it cool. Do not expose the ZOLL PD4410 battery to high heat or freezing temperatures. Do not leave your battery in your car in the summer. Hot batteries discharge very quickly, and cold ones can't create as much power.Overheat is damaging harmful for you battery, so it is wise to remove the Battery from a when it has been fully charged.
6. If you do not use your acer for extended periods of time (a week or more), remove the PD4410 battery pack from the .

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e. Warranty - One year quality assurance for Li-Ion battery, 30 days money back.