How do I know if my start batteries are frozen?

[Lee Bradley]

I'm not sure what you mean by putting them in series but I would just connect one charger to each battery as if they were not connected.

[DrivingMissLazy]

I'm not sure what you mean by putting them in series but I would just connect one charger to each battery as if they were not connected.

Yes, that is correct.

The negative connector of one charger and the positive connector of the second charter are hooked together and then connected to the center connection between the two batteries. The positive connector of the first charter is hooked to the positive terminal of the first battery and the negative terminal of the second charger is hooked to the negative terminal of the second battery.
Richard

[Busted Knuckle]

Ok just a little insight to those of us not familar with "those other bus brands such as a Dina (and some others!)" Dina's have a very weird set up with 4 large semi truck style bateries (instead of the normal 2 8D's most of us are familar with). what's weird about it is they have them hooked up strangly (if I remember correctly they have like a three + 1 set up and the shut off switch allows it to be turned OFF, 12V or 24V!) It's been a very long time since I had any experience with them to even begin to recall how the mess of wires went!

Yes Brian if it were me I'd probably replace them all if I had to disconnect them!

FWIW! BK 

[buswarrior]

Hey!!

No heating that will ignite the off gassing hydrogen from the charging!!!!

Heating pad, battery blanket ok. Forced fan electric heater is NOT!!!! Too hot, make big bang...

happy coaching!
buswarrior

[Jeremy]

The ignition temperature of Hydrogen is 932 degrees Fahrenheit (for comparison, wood will burst into flame at 572 degrees). Certainly a good idea to avoid electrical sparks however

Jeremy

[belfert]

Hey!!

No heating that will ignite the off gassing hydrogen from the charging!!!!

Heating pad, battery blanket ok. Forced fan electric heater is NOT!!!! Too hot, make big bang...

I didn't think about igniting the hydrogen.  I started a battery on fire once years ago, but no big bang.

As I don't have any sort of heating blanket, I will probably heat them for 24 hours and then start charging right after  turn the heat off.

Brian Elfert

[Stan]

Jeremy: A tungsten heating element at red heat (in an electric space heater) is probably above the ignition temperature of hydogen. Take my word for it; if you ever blow up a battery, you will forever be extra cautious. When I blew up a frozen battery, there was no hydrogen present. It exploded as soon as I connected the jumper cables. The top blew off the battery along with a significant amount of acid.