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A new battery usually comes in a discharged condition with a very low capacity. It is highly recommended to fully charge new battery packs before use. Rechargeable battery will undergo self-discharging when left unused for a long period of time.
New batteries are hard to be charged. Sometimes, your electronic device may indicate a fully charged condition about 10 to 15 minutes when the new battery pack is being charged for the first time. When this happens, remove the battery pack and let it cool down for about 10 to 15 minutes then repeat the charging procedure. Sometimes, a new battery will suddenly refuse to be charged. If this happens, it is then suggested to remove the battery from the device and reinsert it.

Charge it until the phone tells you that the battery is full and when the phone stops charging.

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Orignal From: how may hours we should charge NOKIA N73 battery for first time?