We made our own custom battery packs, charger, etc. It's using a battery-to-battery charging scheme.
We wrote up our full design, cell cycling results, etc. and have submitted it for journal publication. Hopefully we can release all of this information soon - very exciting!
If your battery is a refillable lead-antimony type, you should be charged to one third of the rated capacity in amp / hours for four to five hours to get to full load. Maintenance free type batteries should be charged with a constant current load can lead the charge as much as 16.9 volts.
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