How I Recondition Cells

Now the question is, can we identify these possibly dehydrated cells quickly before we invest time in them ?

We will find out, I have 28 modules ready to go

I will discharge them then charge them at 10 amps for 5 minutes then discharge them to 6 volts at 1c then measure the voltage rise after 4 minutes as well as graph, and see if we can spot these possible dry cells.

The X1 Pro charger will be a great help, it has a discharge charge cycle, combined with the max amps in safety I can tell it to cycle and insert 0.833 amps (10 amps five minutes) or i can use the max timer and go 5 minutes, probably easier lol.

Then rock my way through the entire pack in under 3 hours

Then use the CBA II and discharge and graph them. Should be one day for all of it.

 

Historically, I would have already placed these in service in the car, this extra 2 week step proved more than 50% have issues with a few having a catastrophic issue.
Taking your time will save you problems down the road.

 

And with this test we can assert a number of things, and accept them as FACT until PROVEN otherwise.

1- The vent opens at 90 psi.
NO ONE SHOULD PURPOSELY PRESSURIZE THESE BATTERIES.

2- Drilling a hole in top, threading it, and inserting a 1/4" pipe thread bound with 10 laps of teflon tape will not blow out before the container vents. Of course, welding it in place using plastic weld which holds to 3,600 psi would be advised, also, the pipe should be nickel or nickel plated, brass is no good and aluminum will react violently.
NO ONE SHOULD DRILL A HOLE OR TAP THREADS OR GLUE THINGS IN HOLES ON THESE BATTERIES,

3- The case DOES NOT SWELL FROM PRESSURE which I knew to be a fact, the case swells due to the electrolyte and collector assembly swelling due to resistance heat and overcharge. This should be avoided, it can be seen during normal end of charge as an opening appears between modules at the top ends/sides. If swelled, immediate discharge will reverse it as will time. Alternatively, and to reach true end of charge in an effort to achieve cell balance, remove the charge upon appearance of swelling, wait three hours, continue charging at 1/3 the previous rate OR 2 amps, whichever is HIGHER. The lowest amperage for end of charge cell balancing is 1.95 per panasonic.

4- The case can swell without venting & The case can vent without swelling, these are established FACT.
These are reactions to completely separate processes which COINCIDENTALLY occur near the same point of time, near end of charge. One has to do with pressure build up from a chemical process that exceeds a cells capability to process and recombine, the other has to do with a totally different area in the cell and is due to heat resistance caused by too high amperage resulting in a mechanical reaction, swelling.

 

My insight is a constant 70 mph and 100 mpg is easy at 45 mph

 

One day, Honda and Toyota may catch up to the mpg in my geo metro xfi, maybe, it has ZERO TECH lol
84 mpg highway speeds virginia to detroit and back for geopalooza

No A/C available on the XFI, I added it from a later model and built electronics to allow it to work with the small engine

On the XFI the A/C now doubles as an ENGINE BRAKE going downhil lol, seriously

 

these are also geo metros

And only available from canada, turbocharged intercooled geo metro

 

In the first image, that low voltage module, that's the one i did that 3 volt discharge on, prior to that, as we all saw when i chose these modules, it did not exhibit that low voltage behavior.
Do not discharge below 6 volts !

 

That would require a large level of effort in removing and reinstalling the cells, and any meaningful data would be most likely not be realized. These cells are old and most have probably lost some water, those that have lost an equal amount in all cells yet provide 95% of the rated capacity could weigh the same or even LESS than a module that has severe dehydration in just one cell that performs poorly and has a high 4 minute resting voltage.

I'll stick with my plan, lot less work and faster.

 

lol, i would still have to disassemble all the modules, instead of just running a tool up and down the pack. and 2 modules could still weigh test incorrectly when compared to actual electronic test and measurement, its common sense. and crystallization is a unicorn in nimh, not a factor

 

The title is "How I..." not "How do I..."

 

deficient, no...
TOTALLY DEVOID
but the Americans with Disability Act protects me and requires / protects my inclusion in society, it does not demand I conform to some "group thought"
lol