So I'm opening up this topic again. I'm worried that over time, my battery might not be able to support the flash cycles (e.g., for when I have to go in for dealer service). Since I live in an apartment complex and no power outlets are available in the garage, I was wondering if a fully-charged jump starter would be able to maintain voltage/power levels for the duration of a flash cycle. I also considered a solar charger but those are trickle chargers, and I'm not sure they would be able to maintain the 10-20 amp rating that the flash process needs. The last thing I need in my life right now is a bricked ECU.