Back in the saddle.

Got my new discharger today, after accidentally reversing polarity and blowing up the old one.
Here's another module that was taken all the way down to 3 volts, and trickle charged at .5A all night.
Almost 5000MAH capacity, pretty darn good for 14 year old modules with almost 190k miles on them.
This line is what you want to see, as you can see the voltage quickly drops at first as the excess charge beyond what the nominal voltage is bled off, followed by a smooth downward trend, and once it reaches the bottom of the nominal voltage, a sharp decline to 6 volts.

 

This is what I bought: https://www.ebay.com/itm/333626507045
You may find some cheaper, but that had the fastest shipping (UPS).
Nice thing about it...it can do 3 modules at once, very nice for discharging multiple modules at once.
Only bad thing about it..it runs off the modules..and cuts out around 5.4V. So you have to use a hobby charger to take each module down to 3 volts.
When it blew, one of the components blew smoke, and charred the top of the component, so no way of knowing what value I need, all I know is that it was a triac.

My hobby charger alerts to reverse polarity, but not this. It's supposed to blow a fuse, which it did, a 40A one at that, but still ended up blowing a component. So I double check the wires before hooking up.

 

I am debating if a module tests to at least 4,000MAh if there is any point in running another discharge cycle? That's 60 percent capacity.

 

Here is the numbers so far from today's discharging, prior numbers are after the modules were discharged/charged TWICE down to 6 volts.

2163-4728
4009-4643
2204-4406
2190-4013
2756-4020.

As you can see there is a clear benefit to discharging down to 3 volts.

 

Last module just discharged at 5007MAh!

Here's a shot of the work in progress, using a .61A current load to discharge each module to 3 volts. Yes, they won't be even when done, but I can then use the hobby charger to evenly discharge them. This just heavily speeds things up.