Computers & Electronics

# laptop battery

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• Jul 24th, 2021 2:14 am
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[OP]
Sr. Member
Mar 3, 2009
553 posts

## laptop battery

Hi Guys,

I have an old Toshiba laptop battery, 10.8volt, 4200 mAh, 48Wh.

I see in some stores they have:

10.8v, 4400 mAh, 48Wh and
10.8v, 6600 mAh, 71 Wh and
10.8v 8800 mAh, 95 Wh.

I guess I would get the first one, are the bottom two too much power? What would happen if I used one of them - fry my laptop?

Thanks.
5 replies
Oct 14, 2010
1821 posts
Barrie ON
The voltage is the only spec that needs to match your current battery.

The mAh rating is a measurement of how long the battery will operate your laptop. It stands for milli-amp hours.

As an example, if your laptop consumes 2.2 amps when it is operating (2200 milliamps) the first battery (4400 mAh) would last for 4400/2200 or 2 hours.

The same laptop with the 8800 mAh battery would last 8800/2200 or 4 hours.

The formula for watts is simply voltage x current , so the 10.8 volt battery with a capacity of 4400 mAh has a Watt Hour capacity of 10.8v x 4.4 Ah which is 47.52 Wh.

NOTE that these numbers were chosen to simplify the math. Hopefully you get longer life than these examples.
Deal Fanatic
Jul 7, 2017
9703 posts
SW corner of the cou…
More capacity. The amperage and wattage is just the power/current and charge capacity. The computer will just draw what it needs as long as it gets the expected voltage..
I smile when I see container ships sailing past my house laden with stuff made in China
Deal Fanatic
Jul 2, 2001
5341 posts
GTA
The 6600 and 8800 batteries are also 50% and 100% bigger than your current battery so they'll stick out like a sore thumb from the bottom.
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[OP]
Sr. Member
Mar 3, 2009
553 posts
Thanks a lot guys!

I was wondering what those numbers were.
Deal Fanatic
May 11, 2009
8185 posts