Traction batteries low when on freeway

Just for the record, what was referred to was a "grid" charger, of which the Prolong system from Hybrid Automotive is the most popular example. (Auto-correct strikes again).

 

For me the charger by itself was enough, some others like the combo charger- discharger, I don’t think you need the discharger but it will come to personal preference but I tell you something if you ever need to rebuild you battery pack (replace a dead cell) you will be ready for the job with only the grip charger to balance the pack.

 

I think you are right about you battery starting to go bad, you described exactly what can happen when a cell in a pack dies, but if you have not done the hybrid battery cleaning yep go ahead and do it to see is that help.

 

As pointed out Frank means grid charger.

 

Sorry for the spelling and letting the autocorrect do his job to much lol.

 

very likely

 

It actually tells you one or both of the modules in block 14 is bad.

You actually mean module, not cell as you cannot get to the cells due to them being sealed inside each module. There are 6 cells per module.

Given that you have said that neither module in block 14 (modules 27 and 28) seems bad, I wonder if you are counting from the correct end.

The count begins from the right side (opposite the ECU) and counts towards the ECU end as shown in the image below.