HP 94 Battery Pack

[Donald Williams]

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?

[Katie Wasserman]

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.

[Donald Williams]

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.

[Katie Wasserman]

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.

[Donald Williams]

Did you cut the front face, back face, right side, or all of the above?

[Katie Wasserman]

I cut out pretty much the entire area underneath the rubber grip as just one large u-shaped piece.

[Donald Williams]

That was my plan.

Once again, thanks for the information.

[gileno]

HP 94 ?

I don't know. Some site on her? 

[Massimo Gnerucci (Italy)]

What about this?