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Re: (ET) batteries

Charger would be about the same; it's lead. The fact I use the factory charger for 90-120 BB600 NiCD cells speaks to its inherent quality.
The problem of course is that 12 volt auto batteries will last for only about 20-30 full discharge cycles before going bad. Built for starting and that's about it. 12 volt deep cycle will work, but you will have less capacity than 6 T105's.
Really I'd be interested in using Lithium compatible T105's or a big ole 36 volt lithium battery. They're designed for Golf carts, and Golf carts have a similar power profile plus their chargers are nuts out of the box so the battery would probably have a good BMS. 

Or we will see flaming golf carts on the links. Either way fun.

Someone should give them a shot.

On 2/18/26 14:30, Mike Finck via Elec-trak wrote:

Gentlemen,

I am considering putting 3-12v automotive batteries in one of my show 
tractors.  It is used very sparingly, I.e. for 100 yd distances (to and from 
trailer). What I do not know is whether I should expect the on-board charger to 
handle the charging?  Would I set the timer for different (less) amounts of 
time compared to the robust bank of 6-6volt batteries?
As an aside, a couple years ago I rigged 4-18v drill batteries into a parallel and 
series configuration to deliver 36 volts. They moved the tractor nicely but one 
battery shorted out  and I gave up on that project.l
Thank you for any insight.
Mike
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