Batteries - mAh, V and such - would it work?

[comeradealexi]

I was just wondering - say i had a 10.8v 4400 mAh laptop battery and i wanted more life for my laptop - maybe as an emergency backup - theoretically i should be able to hook up 9 AA batteries each with an 1800mAh battery life and then get a total battery life of 16200mAh?

im not expert but i was just wondering if this would actually work?

the same applies for a phone too 3.6v 1500mAh - 3x1.2=3.6 then then u get 5400mAh life?

would it work ?

thanks,

 

[bremen1874]

Nine 1800mAh batteries hooked up as you describe would give you a 10.8v 1800mAh battery.

You'd need to connect the batteries in parallel to get increases in overall capacity. Your 10.8v 16200mAh battery would require 81 1.2v 1800mAh cells.

 

[DigitalReaper]

Don't forget about how much current the laptop would be drawing from your DIY battery pack. 60w (random guess) at 10v (for easy math) would require 6 amps, I doub't an AA battery could safely output that. You would probably need 2 or 3 packs in parallel, and then you'd better make sure that each pack is equally charged.

Charging would be a problem too, you'd probably need to take the pack apart and charge the batteries in pairs (most chargers do it this way). I doubt you could safely charge the entire pack with the laptop power supply (it's not even a charger, that's most likely inside the laptop).