I posted the following in another thread earlier this year...
"Same thing ["Stop Vehicle See Operator's Manual" warning message] happened to me twice in 1 week about 6 months ago...I replaced the 12V in my car with an XS Power Battery and haven't had any Malfunction visit workshop display message since.
I would suggest getting a really heavy-duty 12V battery...yes, they are more expensive, but with almost everything peripheral in our Bs running off that battery, it will be money well spent!
P.S. The XS Power 12V AGM 2900 Max Amp Car Audio Battery D4700 is the one that fits. And don't forget to purchase the terminal hardware, as it doesn't come with the battery.
2014 B250e, Cirrus White
2006 Toyota Prius