Timeline for Car battery at 10v, then shows 14,5v while car running after boost, then when car turns off, drops to 10v again within a minute
Current License: CC BY-SA 4.0
6 events
| when toggle format | what | by | license | comment | |
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| Feb 16, 2022 at 3:01 | comment | added | Loren Pechtel | The key here is the voltage drop. There are 6 separate cells, one of them rapidly leaks away it's charge. There is probably a tiny lead whisker shorting the plates--not enough keep it from taking a charge in the first place, but enough to drain it while it's sitting there. It's a common failure mode of lead-acid batteries. | |
| Feb 15, 2022 at 9:27 | comment | added | JCM | (Continuation) Besides, in some rare cases, a cheap low-power battery into a slightly more demanding vehicle would work as new initially (and in mild summer) but with the use will drain trying to turn on the engine and be useless (in cold winter). Although this is clearly not your case. | |
| Feb 15, 2022 at 9:19 | comment | added | JCM | Its good that you found the solution (dead battery) but disagree with this response, which needs to be more general. In some cases, your car may be draining the battery for some reason such as some equipment is on or broken or a weak short circuit, and this would cause it to run down quickly. | |
| Feb 14, 2022 at 8:21 | comment | added | James T | Thanks, replaced it, and it seemingly works fine now. :) While I expected a new battery to be able start the car regardless, my concern is that the problem possibly is with the alternator or something, and I assume that wouldn't show until the car had driven for some time with the new battery (and not charging it properly). For now everything seems OK though, 14,5V while running, and battery was very slightly more charged after the first test drive. | |
| Feb 14, 2022 at 8:17 | vote | accept | James T | ||
| Feb 13, 2022 at 13:37 | history | answered | Pᴀᴜʟsᴛᴇʀ2♦ | CC BY-SA 4.0 |