Page 2 of 2

Re: 12V battery BCI Size?

Posted: Thu Feb 28, 2019 4:14 pm
by Lithim
This must be the month for 2012 model year batteries to die. (Obtained my 2012 in February, 2013
Mine cratered over the last week. 10.6 volts (still could get ready light to come on) to now 8.4 volts and nothing happens.
Can I put a battery charger on it to get the voltage high enough to start the car? The manual indicates that cables must be disconnected to charge the battery. Is that true or can it be charged safely while still connected.
Interstate seems to have the correct group size replacement.
Stay charged my friend.

Re: 12V battery BCI Size?

Posted: Fri Mar 01, 2019 3:32 am
by kiev
In your case i would not recommend that you try to charge the Aux battery and start your car, nor try to charge the pack until you get a new 12V Aux.

The damage that can result with trying to operate the car with a defective Aux power supply is very expensive.

Re: 12V battery BCI Size?

Posted: Fri Mar 01, 2019 3:37 pm
by Lithim
151R is the correct group size. Changed my lifeless original (2012) battery today for a new Interstate flooded lead acid.
Getting the positive connection disconnected was tricky since there is not much slack in that cable.
All is good.
Stay charged my friend.

Re: 12V battery BCI Size?

Posted: Tue Mar 12, 2019 2:53 pm
by Don
I *finally* got around to replacing the battery in our second car today. The OEM one was 7+ years old and had never shown any signs of getting weak, but I prefer to change things before they cause me problems. Used a Miata AGM again like I did in the first car 3 or 4 years ago. Ordered from Battery Mart for $107.95 with free shipping. Comes fully charged, sealed, maintenance-free and with a one year warranty

To it's credit, the OEM 151R served very well, considering I never added water to it . . . . and it was still working fine when I removed it

So now after 7+ years, both cars have required the same amount of 'maintenance.' One set of tires for each, one set of wiper blades for each, one battery . . . . and, that's about it. First really nice day, I think I'll drain and refill the transmissions. Really can't think of much else to pamper them with. Amazing cars, especially when you consider many hundreds of 3, 5, 7 or 10 mile trips are just about the worst kind of service you can subject any automobile to. We have other cars which rely on trickle chargers to be ready to go because they are so seldom driven. State Farm is making a mint off us insuring cars which seldom leave the garage


Re: 12V battery BCI Size?

Posted: Thu Mar 14, 2019 4:06 pm
by sheinr4143
Big shout out :D to members of this forum for emphasizing the need to monitor the health of aging auxiliary batteries. Used a conductance tester to determine that our factory installed (December 2011) Yuasa battery was degraded by use, time, and temperature fluctuation. The vehicle never exhibited any symptoms of 12v battery degradation over the 7+ years of service life, and we hope to enjoy a similar trouble free and extended period of service from the replacement Bosch 151R.

Many thanks!