These safety instructions must be read carefully and fully understood before attempting to use your battery.
1. let the power of the Samsung Galaxy S4 i9500 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 Samsung Galaxy S4 i9500 battery once a month to maximize its capacity to hold a charge.
3. Don't leave your Mobile phone plugged in constantly when it is not in use. If your Mobile phone always relies on this power, it will loose its ability to last long on its own. So always charge your Mobile phone when the Samsung Galaxy S4 i9500 battery is almost dead and then unplug it from the wall.
4. If you have two or more battery pack of Samsung Galaxy S4 i9500, 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 Samsung Galaxy S4 i9500 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 SmartPhone when it has been fully charged.
6. If you do not use your Samsung CellPhone for extended periods of time (a week or more), remove the Samsung Galaxy S4 i9500 battery pack from the mobile phone.

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