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Steps to Reset a Lithium Ion Cell Phone Battery

by TracyMiller    Sep 12, 2013, 9:22 PM

Lithium ion batteries are the power source of choice for cellphones. Lithium ion batteries are manufactured with a circuit that functions as a kind of fuel gauge. The circuit uses the battery voltage to estimate the "state-of-charge", that is, the amount of usable power remaining. Over time the circuit will become inaccurate and must be reset. Otherwise the cell phone may shut off unexpectedly even though readouts indicate the battery still has power remaining. Cool

1. Use the lithium ion battery installed in the cell phone until the battery power is completely consumed. This will not harm the lithium ion battery because it comes with an internal "safety board". Smile

2. Take the battery out of the cell phone and put it on a charger which is designed for the lithium ion battery. With the charger turned off, connect the battery to the charger following manufacturer's instructions.

3. Plug the charger in and allow the battery to be fully charged. Normally this will take 2 to 4 hours, depending on the remaining battery power. The charger will sense a voltage drop characteristic of the lithium ion battery reaching full charge and automatically stop the charging.

4. Turn the charger off. Now the state-of-charge circuit is reset. Remove the battery and return it to the cell phone which it powers. It's best to use the cell phone immediately for a short period to drain some of the battery power. Lithium ion batteries can last longer if they are not left at full charge. Very Happy

5. Repeat the reset procedure about once a month (every 30 recharges or so) to ensure the state-of-charge circuit is functioning properly. Wink

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