Battery have two main ratings on them: Volts and Amperes. Because size and weight of battery is limited when compared to larger batteries such as car batteries, most companies show their ratings with Volts and Mill amperes. One thousand Mill amperes equals 1 Ampere. When buying a battery, select batteries with the most Mill amperes (or mAh). Batteries are also rated by Watt-Hours, perhaps the simplest rating of all. This is found by multiplying the Volts and the Amperes together. For example:

14.4 Volts, 4000mAh (Note: 4000mAh is equal to 4.0 Amperes).

14.4 x 4.0 = 57.60 Watt-Hours

Watt-Hours signify the energy needed to power one watt for one hour. This battery can power 57.60 watts for one hour. If your machine runs at 20.50 watts, as an example, this battery could power your laptop for 2.8 hours.

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The New Battery Isn't Charging. Is it defective battery?

New batteries are shipped in a discharged condition or with very low capacity and must charged before use. We generally recommend an overnight charge (approximately twelve hours). Refer to the user's manual for charging instructions. Rechargeable batteries should be cycled (fully charged and then fully discharged) three to five times initially to allow them to reach their full capacity. (Note: it is normal for a battery to become warm to the touch during charging and discharging).

Note: New batteries are hard for the device to charge; they have never been fully charged and are therefore "unformed". Sometimes the device's charger will stop charging a new battery before it is fully charged. If this happens, remove the battery from the device and then reinsert it. The charge cycle should begin again. This may happen several times during the first battery charge. Don't worry; it's perfectly normal.

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Use battery needing attention some matters

Carefulness read narrate book of battery, use commendatory battery.
Research the electric appliance and the batteries contact elements is whether clean, when necessity is clean with the wet cloth mop, after dry loads according to the correct polar direction.
New Battery Pack must be fully charged before use.
Li-ion and NiMH Battery can not interchangeable.
Don't make new and old or different model battery put off.
Don't try to make Acer battery rebirth use hot up, charge, or other way.
Don't let battery short circuit.
Don't hot up laptop battery or loss it in water.
Don't strip battery.
Electro-adapter should cut switch after use.
Should take off battery from adapter when battery long time no use .
If you don't use your laptop for a period of time, you must fully discharge then recharge the battery.
Battery should stock in cool place, and dry.

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Laptop Battery Technology Explained

A rechargeable battery is a device that is capable of storing chemical energy that converts into electrical energy when connected to a mains supply. It is made up of different cells that link together to form a complete usable battery. Once the electrical energy has been used or discharged, it can be restored by passing an electrical current through the cells which takes place each time the battery is connected to a mains supply. A typical laptop battery will contain 6 inter-connecting cells.

Li-Ion Battery

A Lithium-ion battery is now one of the most popular laptop battery, Li-Ion batteries are a mixture of Lithium Oxide and a Carbon compound used as electrodes with an electrolyte film which acts as a separator. The lithium ion moves from the anode to the cathode during discharge and vice versa during charging. This type of battery is the best of all 3 for keeping its charge.

NiMH Battery

A Nickel-metal hydride battery uses a hydrogen-absorbing alloy for the negative electrode and nickel oxyhydroxide (NiOOH) for the positive electrode. Generally this battery has three times the capacity of an equivalent size NiCd battery. NiMH batteries are also constructed from non-toxic metals making it more environmentally friendly than a NiCd battery but not as efficient as a Li-Ion battery for keeping ita€s charge.

NiCd Battery

As the name suggests a Nickel-cadmium battery uses both nickel and cadium as electrodes. Generally and older type of laptop battery that is being phased out due to the higher levels of heavey metals required to make it work. This type of battery has the advantage of being able to reach full charge very quickly.

Most new Laptop batteries use "smart" technology, which basically means they have internal microprocessors fitted allowing them to communicate charge/discharge information with your laptop to achieve greater efficiency.

A battery cycle

is the term used for one complete charging and discharging event. This occurs by connecting a suitable device i.e a charger, to a laptop while the battery is in place.

Memory effect

is caused by continually recharging a battery, or topping it up before it is fully discharged. This effects NiCd and NiMH batteries only and result in the battery only remembering the amount of capacity charged and the full true capacity of the battery is not reached.

Overcharging

is caused by exceeding the manufacturers prescribed time for charging your battery, or by not following their guidelines on keeping your battery in tip top condition.