Most laptops use individual 18650 lithium-ion cells. I've successfully repaired old battery-packs by unsoldering and replacing the old worn-out cells in many laptops. The one in my Dell Latitude had (8) 18650 1400mah cells. Replacing them with 2600mah cells gave me over double the battery-life since the old ones were on the verge of complete worthlessness.
The other thing that really helped was to remove the CD-ROM and put a 2nd battery-pack into that bay. I went from 2-hrs per charge to over 6-hrs continuous use with freshly rebuilt battery-packs. You can get 18650 batteries from numerous sources to rebuild your own packs:
- Make SURE
you get the same replacement cell types as your original battery. LiIon batteries have 50% more capacity per size/weight as previous Nimh batteries. HOWEVER, they are NOT interchangeable due to output-voltage differences and charging-circuit responses. Even IF
you can mix & match number of cells in series/parallel to arrive at similar voltages, the voltage-response curve during charging is different. That's been the cause of those recalled exploding batteries. The manufacturers got lazy and used Nimh-charging algorithms and circuit-boards on LiIon batteries.
Last edited by DannoXYZ; 12-13-08 at 04:06 PM.