>>"Have you checked to see if there's anything that might be draining it that shouldn't be?"
>>That's what I had in mind, but I don't really know how. The interior light isn't on, nor are any >>other lights. Is there a way to test, with limited tools and aptitude?
If you've acces to even a cheap multimeter, it's probably got a 10A scale. Select that, close all doors and remove keys, but don't lock the car, disconnect one battery terminal and connect the leads between the battery terminal and battery lead THE RIGHT WAY ROUND. There will probably be a current draw for a short time while all the electrics shut down and then you'll see if there is a parasitic drain. You may have to change to a smaller scale on the meter.
£200 for a battery - sheesh, where's that from Harrods? I've a '14 reg Yaris 1.3 poverty spec and a new (Yuasa) battery was £70 last year.
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