A new replacement battery for the new year
There's been a lot of great discussions this year with valuable new information. And it was time to make a decision for staying in the juice. As anyone following my saga may recollect, I'm down to the last two A123 AMP20 cells in my stash. I had attempted to encourage an opportunity at the A123 AMP20 Cells, new, legit, factory direct!
thread that might have yielded some additional cells for my dwindling stash, but that didn't pan out. davec
almost bit, but decided to opt out, choosing another path. After some consternation, I decided to take another path too. As I said at the A123 AMP20 Cells, new, legit, factory direct!
This has forced to me to reconsider my whole long-term strategy to staying in the juice. This and the A123 20Ah Pressure Thoughts
thread, since the AMP20's require some compression methodolgy in the make, whereas the cylindricals are natively already in proper compression. I had not wanted to reconsider strategy, since I had invested in all the paraphanellia for my 12S 36V AMP20 pack and didn't want to start from scratch. But what with the continuing problematic nature of sourcing the AMP20's, I guess its time.
So, my choice, after a review of many, many different cyclindricals, from Sony, Panasonic, Tenergy and others is the A123 ANR26650
cells from buya123batteries.com. Hence, sticking with the nanophosphate advantage, stepping down to their next hightest capacity cell and in the cylindrical format.
I'll be building it over the next 30 days. In consideration of pack construction:
- its got to be a replicable pack, for a broadening audience, including those taking my ebike workshop
- its got to be relatively simple to source cells & parts, so commonly available
- assembly shoud be straight forward and not difficult, so anyone can attempt the build and succeed, even kids
- the pack should lend itself to disassembly, for inspection and replacement of cells, should any go bad (as they inevitably do over time)
- the cells have got to carry the C rate, and have good amp-hour capacity, and lots & lots of cycles in them
- the cells should be easy to source & buy online
I believe I'll be attempting something so far not covered here at ES, forging new ground. To meet the terms of the above, I wanted to avoid welding and soldering, and make it possible to pop out a dead cell and simply replace it. I'll be using 9V battery snap connectors sourced through Jameco
. The snap will be permanently afixed to the cells with high-grade conductive epoxy (i'm getting the expensive silver stuff from Amazon
. And in the snap, taking wb9k's suggestion for using dielectric grease. Among other considerations.
So I'll video tape it all in the make and post a new make journal, Arkmundi's saga making & maintaining an A123 26650 battery
. Stay tuned, and Happy New Year!