A larger battery may not fix your problem with the car giving battery drain warning messages, the camera is still going to draw the same power so the computer is still going to detect the same drop
Installed a Northstar AGM battery (~$310) with 905 CCA (Advertised to be 880 CCA, but guy said they were a bit more.) who also tested it on the install along with car's charging voltage (~14.5 volts.). I thought it should be a lot better lasting than the OEM sulfuric acid battery which tested at 600 CCA. Aside, it has a free replacement 4 year warranty per the dealer so maybe one good thing. Fwiw, Odyssey and Northstar were same at one time, but two owners split up and one took the Odyssey brand and other took the Northstar one per conversation with battery dealer.
However, this AM it was OFF again as Parking and Monitor scanning LED's were off on front and rear cameras. Grrrr!!!
On review of the microSD card, it shut down around 3:30AM so it did last longer than the old battery which shut down around midnight. The x10 cam I set to auto-reboot at 3AM so it did that fine, but 30 minutes later it turned off. Voltage to shut off I set to 12.3 volts (highest.).
The car, when being started, goes through a "System Check" on the dash. With the old OEM battery it would pop up the "External deice is draining the battery" message but the car would still start. With the new Northstar battery, the "System Check" operates as normal without the annoying "External device draining battery" message so good thing there.
What I will do is set the x10 to shut off at 12.0 volts which might make it last to the next AM and day's driving. Don't know if that will trigger the car's "System Check" error message. New cars are sure temperamental to external stuff being added.
If that fails I may shut off the Parking or Monitor mode. Maybe Monitor mode first, and then the Parking mode.
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Additional added later:
I took out the microSD card and found it had about 15 hours of recordings, and it stopped at 3:30AM. It did not loop from there while in Parking mode. Might be that once the car goes into Motion again, it resumes but unsure. Still to new a system for me.
While I was looking at the card in the computer, the x10 fron cam was squaking about "No memory card inserted" which meant it did not fully turn off as I had thought. It was in some sort of standby mode.
The card was the stock 32GB the camera came with, and it showed about 15 hours of recordings. No audio, just front and rear camera video.
Since the car didn't complain about "Some other device draining the battery" message. It could be the 900 CCA Northstar battery is supplying enough current to run the thing for who knows how long if a larger memory card is in it to write video to.
I'll try a 128GB mircoSD and see what happens as that might make it run for a couple of days - maybe. If so, and the car does not complain about "External draining device" then the higher-capacity Northstar battery upgrade is working well.
C-