Taking Apart a PowerBook G3 (Lombard or Pismo) Battery
This is not for the foolhardy and clumsy, but that didn't stop me! I happened to have a spare PowerBook G3 (Pismo) battery that was holding an ever decreasing number of milliamps, so I figured why not? I'd always wanted to see the inside. (The Lombard battery is identical to the Pismo's.)
A word of caution. All I'm going to do at this point is take apart the battery. Since it involves lithium batteries, please be careful if you decide that you want to follow in my footsteps. I assume no liability for you or your battery. Neither does Low End Mac. So let's be careful!
Using a sharp edge, score along the seam that separates the two halves of the battery case.
Slow and steady. Don't try to force anything. Since this is an "intelligent" battery, there are circuit boards at the front and back of the case, so if you forcefully try to pry it apart, bad things could happen!
My battery case was more strongly fastened at the back than at the front. As a result, I was very careful on the rear of the case.
Watch the area around the power coupling as well. I very slowly pried the case apart at this point in the process.
There you are - the battery case is split in two, and 9 lithium-ion 4400 mAh cells are visible. You can pry out the cells and unsolder them, but I am going to wait until I can lay my hands on some cheap cells.
You should be sure to get cells with the tabs soldered on. Soldering tabs onto regular batteries is not something you can do yourself. I'm waiting to try to find a supplier who has a good price on the cells. When I do, I will post another article on how to solder the new cells into place and how to get the whole thing back together.
Until then, happy Pismoing!
- Mac of the Day: PowerBook 145, introduced 1992.08.03. About 70% faster than the 140, the 25 MHz 145 was quite a value.
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