How to choose the right laptop battery and laptop ac adapter
Finding your laptop Brand & Model
Your owner's manual should have the brand and model on the front cover. If you don't have your owner's manual then almost every laptop has a manufacturer's label on the bottom of the computer. This label should have the brand and model number on it.
Before purchasing an AC Adapter you need to make sure make the AC Adapter will give you the correct voltage and suitable current output.
To find out the voltage & current, turn your laptop over and look for a label, sticker or writing which shows the voltage and current, it should look something like the examples below. The voltage figure will have a "V" after the number i.e 19V and the current will have a "A" or "mA". i.e 3.15A. You can also find these shown on your original AC adapter if you have it. The Voltage must be within 10% of your original AC Adapters Voltage. The Amps may be higher but they cannot by lower.
If you are purchasing a universal Power Adapter or Car Charger you will need to work out the Watts of your original AC Adapter and select the universal AC Adapter or Car Charger with the same Watts or next highest Wattage. You can work out the Wattage by multiplying the Voltage by the Amps i.e 20V X 3A = 60 Watts. There is no 60 Watt AC Adapter so you will need to select the next step up which is the 70 Watt AC Adapter.
PLEASE NOTE: If the wattage requirement for your laptop is lower than the 60W or 90W output of the adapter, it will not damage your laptop, your laptop will only take the amount of power it requires. I.E. If your laptop needs 45W, then either the 60W or 90W will work OK. If your laptop needs 80W then you will need the 90W one as the 75W one will not be powerful enough.
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Once you have selected you Brand and Model from the Laptop Power Adapters Search Wizard it will display the compatible AC Adapters under the product column. Once you have clicked on the battery you will be redirected to the page displaying alllt he information about the AC Adapter. Click on the photo of the AC Adapter to enlarge the image and view the tip dimensions to ensure they are similar to your original AC Adapters tip dimensions.
Batteries have two main ratings on them: Volts and Amps. Because laptop batteries do not carry a very large amount of power when compared to larger batteries such as car batteries, most companies show their ratings with Volts and Milliamps. One thousand Milliamperes equals 1 Ampere. When buying a battery, always go for the battery with the most Milliamperes (or mAh).
Once you have selected you Brand and Model from the Laptop Batteries Search Wizard it will display the compatible batteries under the product column. Once you have clicked on the battery you will be redirected to the page displaying alllt he informationa about the battery. Ensure the battery is the same shape as your original and most importantly the Voltage is within 10% of you original batteries specified Voltage.