1. Carefulnessly read narrate book of battery,use commendatory battery.
2. Research whether the electric appliance and the Hp 7400 laptop batteries contact elements is whether clean, when necessity clean with the wet cloth mop, after dry loads according to the correct polar direction.
3.When non-adult custody, don’t let the child replace the battery, compact battery like AAA should be placed at somewhere the child can't attain.
4.Don't mix up new and old batteries or put different model batteries together.
5. Don't try to make Hp 7400 battery rebirth use of hotting up, charging,or other way.
6. Don't let battery short circuit.
7. Don't hot up 7400 laptop battery or loss it in water.
8. Don't strip battery.
9. Electro-adapter should be cut switch after use.
10.Hp 7400 battery shoud be take off from adapter when it is long time no use .
11.Battery should be stocked in cool and dry places.

How to Charge the Li-ion Hp 7400 battery?

Claims of fast charging a Li-ion Hp 7400 laptop battery in one hour or less usually results in lower charge levels. Such a charger simply eliminates stage two and goes directly into 'ready' once the voltage threshold is reached at the end of stage one. The charge level at this point is about 70%. The topping charge typically takes twice as long as the initial charge.
Depending on the charger and the self discharge of the Hp 7400 battery, a topping charge may be implemented once every 500 hours or 20 days. Typically, the charge kicks in when the open terminal voltage drops to 4.05 volts per cell and turns off when it reaches 4.20V/cell.
No trickle charge is applied because the Li-ion laptop batteries for Hp 7400 laptop is unable to absorb overcharge. Trickle charge could cause plating of metallic lithium, a condition that makes the cell unstable. Instead, a brief topping charge is applied to compensate for the small amount of self-discharge the Hp 7400 battery and its protective circuit consume.

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