You might also check the 12v battery, if it's limping along on the original or a dead one it would have to be constantly recharged by the HV battery & inverter running more often. Our 2013 had the original battery still in it when we bought it a couple months ago, clinging on at 11.9v. Mileage seems to have improved slightly with a fresh one.
Yuasa builds a damn fine battery. The one in my C14 is still hanging in there after 6 years.
Yuasa is the good stuff. It's all I'll use in my bikes.
My battery was the [factory one from 2007], changed it in 2023. Couldn't find a replacement Varta back then and had to choose fast, so I picked Yuasa (Japanese brand) and it's working good till now.
I bought a shorter mobility scooter battery with same chemistry as the original, YUASA REC36-12, however the polarity was reversed. I extended the negative pole and installed it without an issue and car came back to normal.
Nice hack. I have a Yuasa that will be 13 years old this year and still going.
I have a 2016 Gen 4 that my partner commutes about 100 miles round trip in. Aside from its strange looks it's a great car. Zero repairs so far at more than 220K miles. No rattles or clunks. Every single electric button and switch still works.
I have a yuasa ybx 3000 recharging battery for Mazda 6 2011. I've had it three years with no problems since recently.
My 2012 recently needed a battery replacement
So on top of cold weather, your battery may need attention
Unfortunately have to disagree about Yuasa, This 2018 battery is not the same as what you will get as a replacement from Yuasa today. I think they moved manufacturing from Taiwan and the quality has fell. My last two DRZ400 batteries were Yuasa and they didnt last 2 years. Even with tender on for the few months I didnt ride the bike.
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If choosing battery across many manufacturers, check the part ranking. If your choice is down to two brands, the PartReview part comparisons help.
We compare battery across these categories:
In March 2026 on PartReview, battery YUASA were overall better than OEM Toyota.
In March 2026 on PartReview, battery YUASA were overall more popular than OEM Toyota.
By vote balance, battery YUASA surpassed OEM Toyota:
By number of reviews, battery YUASA surpassed OEM Toyota:
In March 2026, according to PartReview, these manufacturers led the same number of car-specific ratings:
OEM Toyota are chosen by owners of cars such as: Toyota Prius, and others.
YUASA are chosen by owners of cars such as: Mazda 6, and others.
If this comparison didn’t fully answer your question, there are many others on PartReview.
For example, comparisons of battery OEM Toyota with: OPTIMA, Varta, Bosch, OEM Subaru, OEM Volkswagen, Tesla, Duralast, Exide, OEM BMW, Deka.
Also available: comparisons of battery YUASA with: OPTIMA, Varta, Bosch, OEM Subaru, OEM Volkswagen, Tesla, Duralast, Exide, OEM BMW, Deka.
You can also see who is better among other battery manufacturers: OPTIMA or Varta, OPTIMA or Bosch, OPTIMA or OEM Subaru, OPTIMA or OEM Volkswagen, OPTIMA or YUASA.
