Re: HP-41 rechargeable pack Message #5 Posted by David Smith on 14 Feb 2003, 5:59 p.m., in response to message #4 by Randy Sloyer
If you are buying your cells from a Batteries Plusm Batteries Etc, etc just have them weld the string up for you... no need to risk damaging these very delicate cells with soldering iron heat. The smaller the cell, to more likely it will be damaged by heat.
I cut my packs open with a razor blade (or two or three depending upon how many I break). The 82120A packs are very well sealed, but do give in to a little razor work (and sometimes a tap or two with a hammer... wear eye protection).
Then I bring the half of the case with the little cut out windows and the charger circuit (with the old cells still connected) to the battery store so they can get the cells spaced properly.
Normally I just have the battery store cut open and rebuild packs, but not for the 82120A. I want to test the charger circuit before I seal it up, and I don't trust them to get the contact springs installed properly.
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