Cheap laptop = short laptop battery life? HP Compaq Presario CQ40 proves the opposite with 3:26 hours. The battery life is only a lot shorter under high processor load. The 25 watt AMD V140 manages to drain the 4400 mAh HP 485041-003 battery (48 Wh) after 1:17 hours.
Charge and discharge HP laptop battery instructions
1. Install your newly purchased battery into your laptop
2. Disconnect the HP laptop AC adapter and use your laptop until it itself shuts down. In this situation, the battery is fully discharged.
3. Connect the AC adapter and your battery should start charging.
4. Charge until the battery is full.
Repeat this charge and discharge cycle a few times and your HP 484170-001 battery pack will be conditioned to perform at full capacity.
Note: Please do not overdischarge and overcharge your laptop battery.
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