1. let the power of the SONIM BAT-01500-01S 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 SONIM BAT-01500-01S Cell Phone 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 SONIM BAT-01500-01S battery is almost dead and then unplug it from the wall.

4. If you have two or more battery pack of BAT-01500-01S, 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 BAT-01500-01S 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 Cell Phone battery, so it is wise to remove the Battery from a Cell Phone when it has been fully charged.

6. If you do not use your SONIM Cell Phone for extended periods of time (a week or more), remove the SONIM BAT-01500-01S battery pack from the Cell Phone .

* 100% compatible to replace your old use.

* Substitutes made from modern technology.

* With the international Standard Control from R&D, Manufacturing and test, Our battery for SONIM BAT-01500-01S have passed CE, UL, ROHS, ISO9001,QS9000 and TS16949.

* Quality battery uses an intelligent control chip, which comes with higher performance and reliability.

* Built-in protection circuitry ensures its stability and safety, fast charge but slow power consumption.

* Guaranteed safety: Protected against Short-circuits, Overheating and Overvoltage.

* 30 days money back, one year warranty, efficient and fast after sales service.