HP Forum Archive 06

[ Return to Index | Top of Index ]

2/3 AAA NiMH batteries Message #1 Posted by Brian on 14 Sept 2001, 12:24 a.m. Anyone tried 2/3 AAA NiMH batteries in a HP41C ? Here's a website that sells them. http://members.aol.com/davthacker/radicalrcbatteries.htm see Sanyo Single Cells section -Brian HP41CX RULEZ!

Re: 2/3 AAA NiMH batteries Message #2 Posted by Steve (Australia) on 14 Sept 2001, 6:24 a.m., in response to message #1 by Brian Size N is better :-) They're very commonly (and cheaply) found as replacement batteries for protable (as in not mobile) phones. Major problem is that they usualy come in sets of three, but they're so cheap you can buy 2 sets.

Re: 2/3 AAA NiMH batteries Message #3 Posted by Brian on 14 Sept 2001, 9:17 p.m., in response to message #2 by Steve (Australia) Are you saying N size NiMH batteries are available? I only have the 4 'N' battery holder for my HP-41CX. 2/3AAA size batteries will fit in it too. I have been using NiCad N cells but would rather get NiMH. -Brian

Re: 2/3 AAA NiMH batteries Message #4 Posted by David Smith on 14 Sept 2001, 4:34 p.m., in response to message #1 by Brian Assuming that you want to use them in the rechargeable battery pack, yes they can be made to fit with some shim spacers. You might not want to do it though. These cells are only 50maH, the regular 1/2N cells are 80maH. The charger dumps 15ma of charge current into the cells and you risk over charging them after only 4 hours. A better solution may be 150maH NiMH cells. They will need a 3/16 inch or so thick shim along the back of the cell string since they are around .160 inches shorter than the 1/2N cells.

Re: 2/3 AAA NiMH batteries Message #5 Posted by Steve (Australia) on 14 Sept 2001, 9:30 p.m., in response to message #4 by David Smith I think Brian was thinking about using them in the standard battery holder as opposed to replacing cells in the nicad pack. I have sucessfully replaced the 1/2 N cells with 1/3AA cells. This requires quite a bit of work milling and cutting plastic, but you get about 2x the capacity. For the real extreme hardware hackers out there, if NiMH come in this size you could do even better :-)

Re: 2/3 AAA NiMH batteries Message #6 Posted by Katie Wasserman on 15 Sept 2001, 6:30 p.m., in response to message #5 by Steve (Australia) Either the 1/3-AAA or 1/2-N nicads will work in the 82120A battery pack. The 1/3-AAA's are more readily available but they are harder to make fit. The 1/2N are still available and are an exact replacement. See the article (on this site) that I wrote for more details.

Re: 2/3 AAA NiMH batteries Message #7 Posted by Steve (Australia) on 15 Sept 2001, 8:59 p.m., in response to message #6 by Katie Wasserman Yes, but 1/3 AA have certain advantages :-) Although not for the user who wants cosmetic perfection.

[ Return to Index | Top of Index ]

Go back to the main exhibit hall