The trickle charger, if used regularly, can bring a sulphated battery back to life. That prevents it from further accepting a charge, so even if you drive for 100 miles one day on the freeway it might not fully charge up. The problem is when that happens, you can end up with a sulphated battery. If you don’t drive the car very often and when you do, typically only a few miles of stop and go city driving, that can prevent the battery from ever fully charging. and if the drain on the battery is 50 mA (0.05 amps) then you have 35 amp-hour / 0.05 amps 700 hours or 29 days. 12V 140 Amp Smart Dual Battery Isolator Voltage Sensitive Relay For Yachts RVs (Fits: Toyota RAV4) 129.19. Eg, if the battery capacity is 70 amp-hour and you don’t want to discharge it past 50, ie, 35 amp-hour. There are cell phone apps that will take a photo every few minutes, set it up to take a photo of the meter, something like that might work. You can use that with the capacity of the battery to calculate how long it will last. You’d have to have the current monitored over the course of the night to know for sure. But it will turn the computers on, and they draw quite a bit of current. That wouldn’t necessarily turn the dome light one, as it might just happen for a second or two. The door switch would have to be out of adjustment too. Toyota RAV4 in Ontario, Canada Feb 2017 - Jan 2022. Or a raccoon or house cat runs across the top of the car, something like that. Car failed to start Dealer replaced battery under warranty, to resolve the issue. Pulled starter relay, bridged hot pins with ignition on and got starter to turn. Further twists of key did nothing but turn on dash lights and hear a quiet click. If the wind blows and it jiggles a door switch, that can happen. RAV4 starter went for a second then died. The solenoid isolator uses a continuous duty solenoid to connect the auxiliary battery during certain times (like starting and charging) then disconnects when not in use. Something is turning on in the middle of the night and they are not able to catch that with their parasitic drain current measuring method. If they’ve checked the parasitic drain and found it to be less than around 75 mA, about the only thing I can think of, just a guess I’m sure you understand since I’ve never seen your actual car, are these two ideas
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