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I don't even think I'd go through all of that now that we know the flashlight is not on a switched circuit. The battery-charger-battery circuit isn't particularly efficient and will present a relatively large parasitic draw. I'd bet it's in the neighborhood of 200 mA even if the flashlight is charged.
I don't think a Suzuki is getting emails from a cloud. Most (all?) of those things are off with the ignition being turned off. Sirius updates and is live with the key - and keyless entry find have been around since the 1980s
My car has gone through three batteries in the last two years. The only 'drains' to the system that I know of are the clock/radio memory and a streamlite flashlight charger hooked up in the trunk.
Any ideas?
Well, the results are in, the flashlight draws 0.21 volts ....
Look into an AGM battery. Absorbent glass mat.
Doesn't need to be vented if it's a trunk mounted battery either.