Thanks for the suggestion, that would work and may be the solution I will be forced to use. I would prefer to find a battery holder which will allow me to insert them into it and remove them for individual charging and checking of individual mAH capacities over time but that isn't a deal breaker on the project. I am betting someone makes what I'm looking for, just haven't found them yet. If nothing else, I suppose I could hire someone to machine a 21700 cell holder pack for me which holds three sets of three cells in series, perhaps four sets. I am not in a hurry and the expense of a custom battery holder can be borne due to that. Anyone know of a good machine shop who can do that kind of work, perhaps has done so in the past for battery packs?
Chris
PS: I fixed the 21700 link, the joom link worked for me just now using my Qatar IP, but not when I used a state side VPN, it appears they won't allow access to that link unless in the country it was created in/for. I've attached a photo of a similar battery holder, below, but again for AA batteries where I want to use the 21700:
Last edited by Laser57; 04-04-2022 at 08:20.
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