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HP 94 Battery Pack
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Post: #1
08-25-2007, 03:35 PM
 I suspect that my HP 94 battery pack has some dead cells. I wonder if anyone else has opened one of thses packs before? I would rather not do any more damage than is necessary. The case may split easily, but I am going to hold off, in hopes that someone else may have more information. Katie, have you had to deal with this problem yet?
Post: #2
08-25-2007, 09:52 PM
I've rebuilt a couple of 94 battery packs, they take some time. The way I did it was to peal off the rubber grip, cut out a large section of the housing where the grip was using a tiny Dremel circular saw. Then I replaced the cells with 4 AA ni-cads because it was too hard to fit the original 2/3 C cells into place within the opening that I cut. Finished by gluing the removed section back into place and put the rubber grip back on. I used carpet tape to put the grip on with, it's a really sticky double-sided tape and exactly the right thickness. The packs look untouched when completed because the rubber grip hides all the ugliness.
Post: #3
08-25-2007, 10:31 PM
Quote: I guess you are telling me the case is somehow heat staked or heat sealed, so cutting is the only option? My preliminary inspection led me to this conclusion but I was hoping for a miraculous cure. Thanks for the information. It will be a back burner project. I can power it up with a lab supply for the time being if necessary.
Post: #4
08-26-2007, 10:35 AM
Yes, cutting seems to be the only option in the 4 battery packs that I've seen. Clearly they were assembled in two halves with a longitudinal seam, but I have been unable to open them along this seam.
Post: #5
08-26-2007, 11:34 AM
Did you cut the front face, back face, right side, or all of the above?
Post: #6
08-26-2007, 05:25 PM
I cut out pretty much the entire area underneath the rubber grip as just one large u-shaped piece. |
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