Ive got a couple Rav-4. A2013 diesel ( NZ)and a 2015 gas , the std battery is very small, had problems with the Rav-4 gas, in the cold, here in Canada, the Factory battery is only 550 amp, lots of room for a bigger battery, ive got 1000 amps in both now, and havnt had a problem since,
You can try a smart charger, it wont likey work, once battery has deteriorating plates it pretty much over, I probably change 200 batteries a yera on earth moving equipment, but we have extremely cold conditions,
A solar charger hard wired in on the roof will be out of sight for the most part,
I have a cigarette lighter charger, plugs in to cigarette lighter and puts a small charge in, works for cars that sit, this may be another option.
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