I got my oil changed yesterday and the tech informed me my battery should be replaced. I thought 12.4V was okay? Maybe the other values are the reason?
It's good; this car will start all the way down to 11VDC. Check the electrolyte levels and recharge if needed. If it's going to fail, it'll probably do it on a cold winter morning. You can use a cheap jump pack to get it started. If your nervous about it, replace it. I routinely had batteries last me at least 10 years, sealed batteries - not so much. I believe your 2016 has a lead acid battery under the hood, drivers side. Electrolyte access ports using a nickle or quarter to unscrew.
Dealer battery tests measure the "starting amps" which is the maximum current that the battery can deliver. It is an indication of battery health, but has little relevance for a Prius. We do not use the 12v battery to spin start the engine. Our 12v battery just needs to run a couple of pumps and initialize the Prius electronics which is a much lower current than starting a non-hybrid car. My 2020 Prius battery is 5 years old and the dealer has flagged it for replacement for 2 years. It still reliably starts my Prius and I will replace it when the resting voltage falls below 12v and /ordrops more than a volt under load (headlights on). JeffD
