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Yes, that would be a good start. The drivers door has a label that tells you the voltage of the system. That would be the nominal voltage assuming 1.2 volts a cell. Fully charge the D sized cells are 1.5 volts and usually 6.5 amp hours. The batteries are welded together in a heat shrink tube and some have a temperature probe tucked inside.
Much like your 6 D cell mag light one bad cell will make it not run as long or as bright. One bad cell in these sticks does the same. Once the capacity is reduced to .65 amp hours is when you get the check engine light. Sounds like you are at this point.
Plan A is to trickle charge the whole back at .350 ma til the voltage stabilizes to rebalance all cells good and bad. You can rig up one with a few meanwell power supplies with the output in series to develop the voltage. The insight website may have someone near you who will help out.
Plan B is to cycle all the sticks with a hobby charger 3-5 times noting the capacity. Most hobby chargers are automatic and you just connect it, set it to nickel metal and press start. Then you match the sticks or pair off the worse with the best.
Use to be you can buy an old pack and have enough from 2 to make 1 solid pack, but the gen 1 used battery packs are all about used up at this point.
The accord maybe more rare?
FYI, once you flip the switch to off under the cover you posted a photo of wait 5 minutes before touching anything. Inside is 3 large capacitors that need to drain and they do so fairly quickly. It uses 3 of them and some other neat parts to give 3 phase dc to the IMA motor and back.
The 4th orange wire is for the dc to dc converter which feeds 12 volts for the charging system.
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