[Upgrading, Modifying and Unlocking] plasmar:
!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! *warning* !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

if anyone is gonna attempt this please be extremely and absolutely careful as lithium ion and lithium polymer batteries are extremely dangerous and can cause a fire or explode if they leak either from a puncture or from overheating, and I will not be held accountable/liable !!!!

!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! *warning* !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

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I had originally tried using the circuit board off the original 1100mAh dell axim battery however the result was that it limited how much the cells could charge, and so it didn't give any advantage over the stock 1100mAh battery and battery cover... I ended up using trying out a Cameron Sino 3600mAh battery off ebay(not always known for the greatest source of batteries a person can trust and not greatest brand of battery, however it was highest labeled specs I could find)....

Specs references for the various batteries:

dell stock - 3.7v 1100mAh (single cell)

sino cameron dell axim x51 battery - 3.7v 3600mAh(3 cell lithium ion, 3 cells are in parallel)

sino cameron tungsten/palmone battery - 3.7v 2700mAh(2cell lithium polymer)

generic tungsten/palmone battery - 3.7v 2000mAh(2cell lithium polymer)

I had originally used 1x 2000mAh cell off one of the tungsten battery packs, and the 2x cells off the 2700mAh tungsten battery pack, however I eventually ordered 2x 2700mAh battery packs(with intention to use 3 of the 4 battery cells) for safety and better battery life as when the cells are in parallel I believe they charge equally(they act as a single cell and I think that the smallest cell will limit the others charging ability)....

!!!! Important to note !!!!

Though I didn't myself its a good idea to try keep the original thermal fuse that came from the stock 1100mAh battery to use with this experiment(be careful cause this component is heat sensitive, there is no direct hazard if you ruin it.... but there is a lot of safety added if you can keep it instact and use it in this make shift internal battery....)..... pretty much what the thermal fuse will do is that if for any reason the battery starts acting weird and the cells overheat, the cells will disconnect from the axim and likely keep the cells from overheating which isn't a good thing since many of us will be using this devise in their pockets;P....... if for any reason you fail to keep the thermal fuse intact or just don't have one...... I would suggest monitoring the x51v closely for the first couple of charges and discharges and don't think twice.... I found when charging and discharging the battery if working properly makes little to no heat, by no means should the heat be able to burn you..... base how hot is normal by how the pocket pc acted with its stock battery as the result should be similar..... and for any reason its not check that the wires are all ok..... check that non of the cells are bubbled up they should have no air in them what so ever.... for any reason they do I would replace that cell or possibly all the cells pending.... and monitor again

tip: if you end up charging all the cells and find that for some reason one cells seems defective or for whatever reason you need to replace a cell after having charged all the cells in parallel.... either drain the remaining cells using the pocket pc or place the replacement cell as you would normally and allow some time for the 3 cells to level off in charge....... do not try and charge the batteries right away as you may kill the replacement cell

heres some pictures of the axim:

http://usera.imagecave.com/djpc47/axim/P1030205.JPG

http://usera.imagecave.com/djpc47/axim/P1030203.JPG

http://usera.imagecave.com/djpc47/axim/P1030202.JPG

http://usera.imagecave.com/djpc47/axim/P1030201.JPG