Laptop Batteries - Does the number of cells matter if the MAh is the same?

14 replies
Found 20th Jan 2010
Hi,

Im looking to buy a long overdue, new laptop battery for my Acer 5920g.

The original is a 4400mah, 6 cell, 11.1v.

Ive seen a 4800mah 6 cell 11.1v replacement, or for £2 more a 4800mah 8 cell 14.8v.

Is there any benefit to the 8 cell? Is the voltage increase even safe?

14 Comments

cant help you with that but out if interest where are you buying from and what sort of price is it?
my battery on my acer won't hold a charge at all and I can only use it plugged in permenently
I really need a new one

8 cell battery on [email protected]£35.99 delivered 270506465598
8 cells longer battery life looks good

Original Poster

souljacker;7607900

cant help you with that but out if interest where are you buying from and … cant help you with that but out if interest where are you buying from and what sort of price is it?my battery on my acer won't hold a charge at all and I can only use it plugged in permenentlyI really need a new one



Only ebay - £25 is cheapest new.

cheers I'll have a look, just noticed, you have the exact same model laptop as me, how old I'd yours? mine is just over a year and the battery has already gone!

Original Poster

bigwheels;7607957

8 cell battery on [email protected]£35.99 delivered 2705064655988 cells longer … 8 cell battery on [email protected]£35.99 delivered 2705064655988 cells longer battery life looks good



Im pretty sure the 8 cells over 6 doesnt give more battery life, as thats down to the total MAh isnt it?

Just wondering if there was otherwise a benefit to the 8 over the 6?

theoretically no it doesn't matter so long as the voltage is the same..

e.g. 4x 400maH batts or 8 x 200maH.......

personally tho i'd go with less batts bcos they will probably be lighter..!

but since the voltage isnt the same in your case, go with the same voltage you had before..

Original Poster

souljacker;7608076

cheers I'll have a look, just noticed, you have the exact same model … cheers I'll have a look, just noticed, you have the exact same model laptop as me, how old I'd yours? mine is just over a year and the battery has already gone!



Yes, you bought at the same time as me - from cdiscount with the £50 cashback, plus the extra £20 for the graphics card mess up.

My battery dropped to lasting 40 mins within 3 months and was dead after about 5 months.

Acer customer service was impressively bad and refused to replace as it was 'used' (uhuh).

CDiscount were going to try to get one for me, but they went silent and i gave up the chase.

'Shame' CDiscount went bust, and as for Acer, ill not be buying from them again.

Original Poster

Burty;7608128

The same acer model may come with a different type of charger and even … The same acer model may come with a different type of charger and even power jack size depending on when it was produced in the production run.I know this as I had a problem buying a power supply for my old acer laptop. I'd be reluctant to use a different voltage power supply unless acer told me it was ok, maybe contact them.http://www.kpsec.freeuk.com/ohmslaw.htm



Sorry - its not the charger in question, its the battery.

My charger is 19v though, so i would assume the extra 7.9v over the battery is to allow for simultaneous mains use and battery charge?

Number of cells is pretty much equivalent to the number of batteries inside the battery pack. The 8 cell will have a longer battery life then the 6 cell.

Original Poster

Inquisitor;7608123

theoretically no it doesn't matter so long as the voltage is the … theoretically no it doesn't matter so long as the voltage is the same..e.g. 4x 400maH batts or 8 x 200maH.......personally tho i'd go with less batts bcos they will probably be lighter..!but since the voltage isnt the same in your case, go with the same voltage you had before..



Thanks. I thought it wasnt any different, in terms of battery life, but wanted to check!

I didnt think about the cell weight though - the laptops already heavy enough, so will go with the 6 cell :thumbsup:

Are you sure an ebay one is going to last any longer than the original acer one?

Original Poster

EndlessWaves;7608533

Are you sure an ebay one is going to last any longer than the original … Are you sure an ebay one is going to last any longer than the original acer one?



Absolutely not, but how can I be?

The original did last more than 2.5hrs at first, but died so very quickly.

I have heard acer use cheapo parts where possible, so im hoping this new battery will be a step up. Possibly not though!

Possibly something wrong with the description of the batteries. They are both 4800maH so they both have the same capacity....but if the batteries are made using the same cells then the 8 cell battery should have a larger capacity (6400maH).

Of course this type of thing happens all the time on Fleabay. Sellers with no technical knowledge just cut and paste descriptions without checking the facts.

For £2 more it's worth a punt on the larger battery. The voltage increase will have no effect. The laptop will have internal stabilisers which correct this.

Krosus;7609917

Possibly something wrong with the description of the batteries. They are … Possibly something wrong with the description of the batteries. They are both 4800maH so they both have the same capacity....but if the batteries are made using the same cells then the 8 cell battery should have a larger capacity (6400maH). Of course this type of thing happens all the time on Fleabay. Sellers with no technical knowledge just cut and paste descriptions without checking the facts.For £2 more it's worth a punt on the larger battery. The voltage increase will have no effect. The laptop will have internal stabilisers which correct this.



why? I dont know for sure if laptops have voltage stabilisers, again i assume so, but im sure its meant to work at the rate of what the original specs. NOT whatever you wish to put in....... more than likely it will burn it out quicker if unmodified.

put cells/batteries in parallel you get more capacity, put them in series you get more voltage is the generalisation.. (current is also involved but lets not go into that).
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