2013 Energi - I Updated my ACM Software!!! Now need advice on DC-DC

[Misther D]

After a full year of asking others, taking my 2013 Energis (I have 2) to the dealer, and constantly having to jump start my cars,  I have finally gotten around to learning Forscan and updating my ACM.  Worked well but one now has a low battery and driving it a few times didn't charge it.  I had my local auto supply store test the battery and it tests fine.  They said that my Voltage Regulator is bad.  Not true - right?  No Alternator mean no Voltage Regulator - Right?

 

My question:  Is there anything equivalent to a Voltage Regulator that could be causing the battery to not charge? Is that the DC-DC? Or is this likely just a matter of buying a battery charger and letting it charge overnight?

 

D

[homestead]

Short drives won't fully charge the battery.  Stick a battery charger on it and charge it fully.

See how that goes before changing anything.

 

[cr08]

Really easy way to check is simply check the voltage while the car is running. It should normally show 14+. If so, follow homestead's advice. Also if this is the original 12v battery, it's way past its useful life and likely needs to be replaced.

[Loooney2ns]

I am having a similar issue. I completely lose 12v power intermittently. No power at all, like the battery is disconnected. The next day, it's back to normal. After the second time, I took it to the dealership. I also had a POA92, which turned out to be a disconnected rear battery cooling fan. I had a new battery installed when I purchased it. The dealer said it was all fixed, reprogrammed, and ready to go. When I went to pick it up, it was dead again. Still there a week later. They did a draw test and there is no draw at all. Has anyone had a similar experience?