The two primary kinds of batteries used in cell phones are lithium-ion batteries and nickel-metal-hydride (NiMH) batteries. Lithium-ion batteries generally last longer, but both types require care and proper charging for best service.
Lithium-Ion Batteries.
To condition a lithium-ion battery, fully charge the battery and then use it until it is fully drained before recharging it. Repeat this three times for proper conditioning. This helps the battery meter give accurate readings, ensures you get the maximum battery life out of each charge, and prevents overcharging. However, once the battery is conditioned, you do not need to fully drain it every time before recharging.
NiMH Batteries.
Condition a NiMH battery the same way as a lithium-ion battery. However, NiMH batteries suffer from the "memory" effect. That is, they lose some of their maximum charge abilities if they're frequently charged when they're not close to being drained. They "forget" that they aren't fully drained and indicate a full charge when there are still cells that are not fully charged. Over time this can decrease charge capacity, leaving the battery able to charge only some of its cells.
Charge only when the battery is close to being completely drained so a full charging cycle can take place. Do not disconnect the charger during a charge; charge it overnight to reduce the chance of needing to take the phone somewhere before it's charged.
General Battery Tips.
Clean the battery and battery terminals clean. Turn off the phone, remove the battery and use a clean, dry cloth to wipe dust and grime off the metal contact points on the battery and cell phone.
Keep the battery out of extreme temperatures. Don't leave the battery in a car for extended periods in any temperature, don't leave it in direct sunlight, and keep it away from sources of heat.
Regularly use the battery. If the battery has been unused for an extended period of time it should be reconditioned as if it were the first time.
Don't expose the battery to moisture or water, drop the battery, take it apart, or alter the battery in any way. You should stick to approved accessories for your cell phone and not try to use a different size of battery.
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