One owner right now is trying to reduce his measured 90 ma. It should stabilize from 20ma to maybe 90 ma. If it is "1A +- 0.2A" that is way too much. I'll probably bring it back to the dealer shortly, but their "its normal" response over the phone was not encouraging.Ĭlick to expand.i would focus on the parasitic current. Which is the fuse they recommend to pull if you're leaving the car off for a couple weeks? So assuming the new battery is not junk it sounds like the consensus is a charging (inverter? ) issue. However the overnight voltage drop on the battery would also indicate excess current drain in the off state. Unfortunately the meter powers down a couple of min later so without staying in the trunk of a locked freezing car I can't see what it settles out at. In the off state, car locked, all lights off, keys not on me, I see current drain bouncing around 1A +- 0.2A. After 30s of headlights it was down to 12.4V. Battery never got close to warm to the touch (ambient here is about 33F/1C right now).After shutting off the car and putting it into standby, the voltage was 12.8V. Charge current into the battery dropped to about 0.5A after starting at 10A initially, so it seems like it is fully charged. Charge voltage stayed at 14.9V +-0.1V the whole time. I left the car in "ready" all morning for about 4 hours. So the battery is only 2 days old at this point, newly installed at dealer. However it's not throwing any fault codes as far as I can tell. I am wondering if it is killing the battery over time. I googled but don't see anyone else mentioning a voltage that high. I spoke with the Toyota service rep, who checked with a technician, and said that 14.9V was fine for Prius. I ran it for 20min last night, this morning the voltage was 12.4V in standby. When I got home from dealer the voltage in standby was 11.9V, so its probable they did not fully charge it before install. The battery label says max charging current is 4.2A. However I just double checked the new battery - The diagnostic menu, OBD, and a voltmeter all tell me its charging voltage at 14.9V - Is that possibly correct? I checked the charge current with a clamp-on DC meter and its 10A. It was probably 4 years old, so maybe not surprising. It had been having issues for a couple weeks and needed jumpstarts when left off for even a day or two at the end so was no doubt failing. My 2012 PriusV 12V battery died and was just replaced by the dealer yesterday.
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