I'm on my 3rd winter of running heated Gerbings jacket line and gloves on my 2012 400. Plenty of heat. If I recall correctly, someone posted the wattage that is available for accessories. According to Gerbings, the gloves draw 27 watts and the jacket liner 77. I've not had any problem with the battery running down.
I have used the Cycle gear hot wired pants, jacket liner and gloves on my 08 burgman 400 and my 99 Helix for the last two winters with no issues and I think it all pulls just a little over 100 watts together.
Running 2 batteries on a 400 is very easy.
The center glove-box has 2 pockets...
one side has the factory battery installation,
& the other side is big enough for a 2 liter bottle.
A second battery will fit there just fine. Use 10 gauge
wires to cross-connect the batteries in a parallel
circuit. You now have twice the battery capacity.
Just make sure that the batteries are rated the same.
A couple of rags, & a couple of pieces of styrofoam
to hold the second battery in place & you're set to go.
Note that adding a second battery doesn't increase your charging system's capacity; consider adding a plug-in battery charger such as a battery tender to top the batteries off overnight if you're overdrawing the battery. And if you actually need the second battery to support heated clothing, you are overdrawing it.
This isn't really a problem, just a reminder that there's no such thing as a free lunch.
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