Hymotion died - plan to remove it this weekend

I'd probably rent an engine hoist?

 

Likely only one of the two modules in that block has a failed cell. Your only option is to replace it with another module with the same capacity as the others then it would be a good idea to use a grid charger to do three cycles of charging and discharging with a final charge at the end. If all goes well that should take a week of downtime.

 

I am not sure which videos have recommended this charger, but according the link below, the description says that it is NOT meant for hybrid car batteries, but more for RC cars.

EV-Peak CQ3 Multi Charger 4x 100W NiMH / LiPO with Built-in Balance

If you have the links for those videos, I would be interested in watching them to see how they are using them.

Here is the link to another grid charger and discharger that a bunch of people use here on PC:
Prolong Deluxe Reconditioning Package – Hybrid Automotive

 

I have a 2009 Prius that had the Hymotion A123 and it gave me a 12 blink message (If I remember correctly - whichever one that means that one of the cells needed replacement).

I postponed the fix for sometime and decided to remove it eventually. I didn't have a manual per say but I took it apart piece by piece.

First the cover, then the individual cells (After unplugging each wire from the back side of the battery cells), removed all the cells one by one, then I was left with the "bottom" part, it took four bolts that I had to hold still from under the car to get them to unbolt.

Then I removed the bottom piece but realized that It was attached to the bumper outlet without an easy disconnect. That's when I opened the screws from the very bottom (which automatically voids the warranty but we both know there's no such thing at this point) and disconnected the wires going to the bumper plug.

It just took a bunch of elbow grease to unbolt everything with either a 10 mil, 12 mil, or an 8 mil socket/wrench.

I kept the bumper plug and simply folded the wires behind the Driver side tail light, then reinstalled the trunk spare tire/storage. It felt good to be honest. I could tell the Prius "liked" it and looked better overall (Height and feel).

Now I don't know what to do with all of it. Thinking of taking everything to a recycle plant or salvage... or?

 

Ah, gotcha. Yeah, that is a very inexpensive way to do it, for sure. The small hobby chargers look to me like something that could be used to diagnose an issue, especially with a bad module, but if you plan to keep the battery maintained well for the next few years or so, then it might be wise to invest in a charger/discharger that does the whole battery at one time. But there is a time and place for them, like if I was buying this to just sell the car as soon as it's fixed I might get the hobby charger 'cause it's cheap, but then again, I might be able to find a good used Prolong charger and sell it with the car so the buyer has a way to keep the car alive for a while at least.

So the hobby chargers are not meant to charge the entire pack at once, but you can still make it work if on a budget. BTW, thanks for sending those videos to me! It was good to watch the way other folks work this issue out.

 

@ZZprius = Interesting configuration on the Hymotion 2x7 stuff. I'd rebuild them if I could find spares that look like that. Otherwise it's going up on eBay for parts. Good looking out!

P.S. Thankfully I don't have that style. I will post my funny setup sometime soon when I get the time to share here with y'all.