Crude Balancing

That would be better than nothing. But if you then slowly charge the whole battery pack to 100% SOC and a bit more it would be a lot better and still wouldn’t take that much more time or effort.

 

And for you, as time is money, you'd be better to assemble the pack and then grid charge using the HA grid charger. If you were to do a proper job, you'd get the discharger ready kit and the discharger. Use them to do a 3x charge/discharge conditioning cycle, finishing with final full balancing charge. Go for the repeat business and have the people come back every 6 months for a condition. Can be done over a 3-4 day period.

 

Based on personal experience and from what I've seen posted on these forums, the BCM does a great job balancing each module in a block as long as there isn't too big of a difference between the two. Moving cells between blocks can help, but I don't think balancing individual cells in their current configuration does a whole lot.

 

If you don't get the pack below 0.8V per cell the voltage depression memory effect will remain and any balancing improvement will be very short lived. You need to cycle the pack with all modules in series to below 0.8V per cell at least two times, ideally three, for optimal cell balancing results.

 

EDIT: Duplicate

 

A word of caution if you are doing this for pay.
You are opening yourself up to a whole lot of liability.
Every single bolt needs to be tightened to the correct spec.
Notice the different types of nuts. They aren't all the same and they need to go back I the correct place. Etc, etc. If you do this for pay, you may want to have a separate company (LLC?) to protect your assets. It is not good if a fire or other accident were to occur as a result of a small error.
If you are doing this for friends, the reality is, it may not be your friends that Sue you, but rather, their insurance company.
And, for your own safety, you may want to consider purchasing some high voltage safety gloves.
Not trying to be a wet blanket on the idea, just want to be realistic.

 

You are just opening the OP to reality.

OP, if you have more than two cents to rub together (figurative), an umbrella insurance policy is a good thing to have as well. Just like a large auto insurance policy.

 

The Gen2 HV Battery contains 28 modules, wired in series. Each module contains six 1.2V NiMH cells, wired in series. One module=6cells*1.2V/cell= 7.2V. HV Battery= 28modules*7.2V/module= 201.6V.

Each module is fully enclosed in a metal and plastic housing, and is not user serviceable, meaning the manufacture did not provide a means to open the module and replace the bad cell(s). It would take a very determined person, to replace a bad cell inside a module. Is this what you did?

 

Don't forget to aggressively probe the wire looms on the modules.
These often are brittle or have breaks or hidden corrosion that has penetrated the thin part of the connection coin just below the ring terminal.

 

You can buy the wire loom itself from the dealer. Helps remove the possibility of bad wiring or corroded terminals.

 

Voltage does not mean the same as State of Charge. So they will not likely be "balanced".
But it probably won't matter that much..... until the next time you need to go back in there.

As long as you have the time, you labor is free and I wouldn't bother putting in much more effort right now.
Now you know how to get in there, so the next time(s) will be much quicker.