by LeftieBiker (Posted Thu, 29 Dec 2016 14:36:28 GMT+7)
You are misinterpreting the small voltage drops as small drops in SOC. Anything under 12.5 volts (and 12.6 or better is preferred) is actually low. Anything below 12.0 volts, in fact, is generally considered "dead." I don't have a SOC table in front of me, but I'm guessing your 12 volt battery is at about 50-60% SOC in the above reading. So it isn't that your car is charging the battery properly, so much as that the little 12 volt battery is stubbornly refusing to die. Image may be NSFW.
Clik here to view.
So here are some numbers... plugged in at 11:15pm last night, finished charging at 2:15am, 14 hours later the battery was at 12.28V. For comparison I also checked the 2 month old battery in our Corolla which returned home at the same time last night. 12.28V is 3% lower than it was at 12.69V.
You are misinterpreting the small voltage drops as small drops in SOC. Anything under 12.5 volts (and 12.6 or better is preferred) is actually low. Anything below 12.0 volts, in fact, is generally considered "dead." I don't have a SOC table in front of me, but I'm guessing your 12 volt battery is at about 50-60% SOC in the above reading. So it isn't that your car is charging the battery properly, so much as that the little 12 volt battery is stubbornly refusing to die. Image may be NSFW.
Clik here to view.
