Charging a older HV battery that has been sitting..

It's VERY unlikely your old battery pack is in any type of condition to function, and is most likely about completely discharged after sitting 2 years. At a minimum, there will be several modules that are completely discharged, making the battery useless for installation. Remember, the HV battery is the power source for starting the engine. If the ecu detects any failures of the HV battery, it won't even allow the main relays to close, so the HV battery never even gets put into the circuit. If you don't have a way to charge the pack all at once, it's possible you can do 1/2/3 at a time with a hobby charger. Charging them is in no way guaranteeing the modules are still functioning properly.

 

I would just be curious to know what your voltmeter tells you on DC volts sitting right there right now 196. ? That should only take a second to read. Then after that you look at the bus bars and nuts and look for the copper getting the patina on it looks nice but not good for electricity conduction frosted nuts All of those things If I saw 125 plus volts I might put my hobby lamp on it and let it discharge somewhat and then put my charger back on it and charge it back up with my charger when there's no change in voltage for 5 minutes charging up then you disconnect the charger but it stands a while to recheck the voltage and then do another discharge and then another charge and so on and see what happens obviously you have time so that's not the issue.

 

It's more like 4 to 6 hours, not 5 minutes.

 

No what I'm saying is is when I hook up my Venice hybrid pack charger to a hybrid pack depending upon where the battery is when I connect the charger I run the charger until there's no change on the chargers voltmeter which is reading the battery in 5 minutes so if I look at the charger and it says $230 volts in 5 minutes if it doesn't go to 231 I disconnect the HV charger as the battery is accepted the voltage it's going to accept That's the recommendation from the manufacturer of the charger. No the battery will not charge in 5 minutes typical though if the battery is sitting at 150 volts 157 volts or something like that usually in about 2 hours I'll be sitting at 2:11 2:30 somewhere in there I have not tried to charge a pack that's sitting at zero DC volts that I know of

 

This is charging it 300 volts at 2.4 amps

 

Yes, I understood that's what you meant. There is no way you can charge past ~ 220 V by waiting only five minutes. If you look at the graph below which shows a typical charge session it takes progressively longer to raise the battery voltage by 1 volt.

The recommendation from the Hybrid Automotive is that when you do not see the voltage rise within 4 to 6 hours then you stop the charge. If you do not do this, you will not top balance the battery.

On the graph (below), the two rightmost solid vertical lines denote 6 hours. The dotted vertical line (between them) is 4 hours.

The next pair of solid vertical lines to the left is ~ 40 minutes and marks the time the voltage took to rise from 235 volts to 236 volts.

If you can raise the voltage by 1 volt (above 235 volts) in less than 5 minutes, your battery is pretty cr4p. The healthier the battery the longer it takes and also the lower the top ceiling voltage.



Detail matters.