HP Forum Archive 17

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HP 94 Battery Pack Message #1 Posted by Donald Williams on 25 Aug 2007, 3:35 p.m. 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?

Re: HP 94 Battery Pack Message #2 Posted by Katie Wasserman on 25 Aug 2007, 9:52 p.m., in response to message #1 by Donald Williams 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.

Re: HP 94 Battery Pack Message #3 Posted by Donald Williams on 25 Aug 2007, 10:31 p.m., in response to message #2 by Katie Wasserman Quote: 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. 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.

Re: HP 94 Battery Pack Message #4 Posted by Katie Wasserman on 26 Aug 2007, 10:35 a.m., in response to message #3 by Donald Williams 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.

Re: HP 94 Battery Pack Message #5 Posted by Donald Williams on 26 Aug 2007, 11:34 a.m., in response to message #4 by Katie Wasserman Did you cut the front face, back face, right side, or all of the above?

Re: HP 94 Battery Pack Message #6 Posted by Katie Wasserman on 26 Aug 2007, 5:25 p.m., in response to message #5 by Donald Williams I cut out pretty much the entire area underneath the rubber grip as just one large u-shaped piece.

Re: HP 94 Battery Pack Message #7 Posted by Donald Williams on 26 Aug 2007, 5:57 p.m., in response to message #6 by Katie Wasserman That was my plan. Once again, thanks for the information.

Re: HP 94 Battery Pack Message #8 Posted by gileno on 26 Aug 2007, 6:02 p.m., in response to message #1 by Donald Williams HP 94 ? I don't know. Some site on her?

Re: HP 94 Battery Pack Message #9 Posted by Massimo Gnerucci (Italy) on 26 Aug 2007, 6:15 p.m., in response to message #8 by gileno What about this?

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