I just purchased some NiChrome wire to sew into my gloves, scarf and pants. Not sure what a good wattage rating is, but I'd only use it for -5C and colder. I was thinking of using a High/Medium/Low using a SP4T which includes on/off and fused on + side. Basically a 10' wire, is tapped to obtain 25W (1/2 length), 32W(5/8's length) and 40W(full length) with their corresponding ohm value for a 12V battery. I have 18650 25R's I could use, all depends on how many amps are being pushed through the NiChrome wire.
Gloves, battery would be top of hand. Scarf, battery wires would be routed ontop of shirt to pants pocket. Jeans, same thing.
At -5C I just need the scarf on low heat.
At -10C I would need scarf, and gloves on medium heat.
At -15C I would need scarf, gloves and jeans on high heat.
I ran into an older guy on a trike, started talking a bit about the motor and battery. He wasnt sure if his motor was dd or geared, he knew the age of his batteries. All purchased on Aliexpress. Great for the winter for a guy like that, no need to worry about slipping on ice and falling sideways. The furthest he rode he said was Mckenzie Mcdonalds to Heritage Costco, not far, I'd say 10-15km at most one way. I do that everyday, staying close to home. Longer rides double that. Even longer casual rides triple that.
The old Makita's are holding up well, I thank Doctorbass for that. Quite a large battery for the capacity, so I have 85 brand spanking new 25R's all within 0.002V of each other. Have to grab my old Tab Welder out and get building. 36V or 48V still havent made up my mind yet. Probably 48V, but them Makita's are 36V so there is that dilemma. Cold cold weather, use Makita's. The new 25R's I will be able to bring in with me, to the YMCA or whatever. Easier to hide them. Had an interesting convo with train driver at end of line. Wires everywhere he was going to bounce me, I kept saying no its not ebike, no its not gas, I stumped him and his ego needed boosting so he told me to move up to the front of the train where there happens to be a bar in the middle of the door. I played it out, 20s normal stop, I tripled that and made sure he could see my wheel. LOLOLOLOL Then the fair checkers came on, and I couldnt tell if it was genuine interest or another power trip. I acted deaf and dumb, but 2nd go around I gave up the beans, he just said cool and went on. That is why I need to start hiding everything, hence 25R for the discharge, and the smallness of 2.5Ah compared to the 1.5Ah. Yes, I am going to go with a custom triangle bag, with a CCM logo as my other post suggested.