These safety instructions must be read carefully and fully understood before attempting to use your laptop battery.
1. let the power of the 15-EH 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 HP 15-EH laptop battery once a month to maximize its capacity to hold a charge.
3. Don't leave your computer plugged in constantly when it is not in use. If your computer always relies on this power, it will loose its ability to last long on its own. So always charge your computer when the 15-EH battery is almost dead and then unplug it from the wall.
4. If you have two or more battery pack of HP 15-EH, 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 HP 15-EH 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 laptop battery, so it is wise to remove the Battery from a laptop when it has been fully charged.
6. If you do not use your acer laptop for extended periods of time (a week or more), remove the 15-EH battery pack from the laptop .

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