Looking for basic load-testing of prizmatic cells.

Well, these batteries are still so new the reconditioning conversation hasn't really even begun... But in general when I've done reconditioning on Prius batteries 6v is the behavior of the batteries once most of the discharge is done. Even after draining them down to 0.6v they will quickly bounce back into the 6v range. Because of this I thought about buying 6v bulbs for a more thorough discharge, but unlike 12v bulbs, 6v are very rare these days and way, way more expensive than 12v bulbs, which can be found for $2 each.

Main problem with using bulbs is there resistance isn't fixed and depends on the temperature of the filament. I use them to get the bulk of the charge out of a module, then I use the 10w resister in the charger to do the last bit of it. @Britprius and others say that this method is a good cheat to speed things up, but in general, best results come from a stable discharge of 250ma, which can take an eternity.

Lastly, the prizmatic batteries are of an identical charge and capacity as standard Prius packs, just configured differently, so I'm not sure why you're saying 7.2v instead of 8.2v?

 

Your talking about rejuvenating your old batteries to resell they, right?

 

When you say "shunt" is that the same thing as a resistor, just more precise?

 

Wouldn’t you be better off getting a hobby charger and doing it that way? Then you could match outputs.

Gen II Prius Individual Battery Module Replacement | PriusChat

 

Calling @TMR-JWAP

 

When many of us first get started that's a common thought... However, when you replace a bad module in a pack the module you replace it with if you by it from a quality supplier is going to be thoroughly tested, as well as reconditioned. That means the reconditioned module won't match the rest of the pack. I had to learn this the hard way and the hassle of red triangles coming back a day or two after putting the car back together is something you may want to avoid.

As for a hobby charger, I recommend the "HTRC T240" Duo which is the highest quality for the lowest price. It has both DC and AC inputs, so you can plug your solar system into it and fill your battery pack up with sunshine.

 

That's the hardest part about working on battery packs... Super precise gear that can accurately track and graph power going into and out of the modules is how you can find good, bad and very best modules. Light bulbs, load tests and hobby chargers come no where near that, which is frustrating!