Prompted by this post I took some 12V battery readings today on my KIA Soul EV 4kWh.Worse still is that over 10 years since the frist BEVs, and 20 years since Prius' and the like, EVERYONE should now know that 12V batteries are a big weak, undiagnosable point.
Why does it take 2 decades of experiences that we are STILL at the point that 12V battery faults are still going undiagnosed and not properly prognosed (is that a word?) in normal BEV setups.
I have advocated for almost 8 years now; EVERYONE get a cheap battery volt reader and superglue* it into your accessory socket. Keep an eye on it during startup, driving around, etc, get used to what it SHOULD say and when it isn't saying those things then know your battery is not doing well.
EVERYONE. RIGHT NOW. JUST DO IT. A QUID OR SO OFF EBAY. BUY IT. NOW. STOP SITTING THERE DRINKING YOUR COFFEE. NOW. EBAY. £1 PLUG IN VOLT METER. JUST DO IT. NOW.
If you only ever follow one piece of my advice, follow that one.
*(Obviously I mean 'just leave it there forever', you don't have to take it literally, unless you really want to! )
Ye it is normal at start up, on mine it usually read 14.4V during running, but on start up it is usually more. This would be the norm for AGM and sealed batteries, but you are right to point out it is a flooded cell battery fitted as standard. It doesn't hurt a flooded cell for a brief moment, and will still serve a purpose to reduce long-term sulphation. The Soul would sometimes back off to 13.6V but was at 14.4V longer than other EVs I have seen (i.e. is looking after its battery better).Prompted by this post I took some 12V battery readings today on my KIA Soul EV 4kWh.
Battery = 12.3V mode = OFF
Battery = 12.22V mode = ACC (DLR & Radio on)
Battery = 14.75 mode = ON/READY
The last reading seems a bit high, I expected 14.4V for the sealed flooded battery.
Is this normal?
Very true. I started in the motor trade in 1966, and one of my first jobs was learning how to fill, charge and commission lead/acid batteries. At that time we could also remove faulty cells and replace them (the equipment looked like medieval torture instruments!) This was usually done on the large, expensive agricultural and commercial batteries.Some of this detail is slightly 'black-art' so is more based on my experience than strict research, and a lot of it is not even known any more to even look up .. I have an old book from the 1960s with a lot more detail in it about lead acid chemistry than anything you can find today. It's sort of funny how hard-won engineering knowledge seems to get 'lost' and has to be rediscovered. Have respect for old books ... , they often contain stuff that has been forgotten already.
I think you meant 'not to do it', but in any case there is a good reason not to do it; replacing a perfectly serviceable lead acid battery is wasteful..... 1) , but it's not a complicated proposition: if you are handy and can replace the battery DIY, there is no reason whatsoever to do it after 3 years.