2006 Honda Insight Questions

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While my Battery Charge indicator showed fully charged, my IMA light and Check Engine light came on. The Battery Charge indicator discharged rapidly. I didn't notice a large change in power, so I kept driving. 2 days later, the battery light came on.
My mechanic says the IMA battery pack may have been overcharged, causing the main breaker to trip.
He reset the breaker by disconnecting the IMA battery cables for 30 minutes, draining a capacitor that was preventing the IMA battery packs from charging.
After reconnecting the battery cables, the 2006 Insight is getting 71mpg on our test drive and recharging the IMA battery properly. We will see how long this lasts.

Has anyone else tried this technique?

My insight has 123,731 miles on it, and this is the first issue I've had with the IMA.