Been looking into this a little more and came across home made heated inner gloves using something called kanthal wire but they started showing graphs and talking about ohlms law and stuff and the possibility of the battery melting.
Can anyone with electronics expertise help me build some, the wire is in different gauges and my plan is to use 2500 rechargeable battery's 2 for each glove.
I only need enough power to heat the second half of 8 fingers and only for 1 or max 2 hours and only on the backs of the fingers.
Heated grips just wont do it for me as its only the fingers than get cold due to sh1t circulation, my winter gloves are good but after about 1/2 hour of riding the fingers start to get cold, my winter riding is a quick 1- 1 1/2 hour blast or until my fingers are too cold. so I only need to add extra heat for about 1 hour.
I was out for about 3 hours yesterday in one of the coldest days of the autumn/winter so far but I was only pootling around from shop to shop in traffic and I was fine but that is not what I usually do when I am out and the main cold factor is wind chill which is why I am thinking of just heating the back of the fingers.
I have looked into hand guards but they just wont fit.
The procedure for defining the design for home-made heated gloves is fairly straight-forward, from the electrical point of view. Of course, the physical construction is another matter.
But it is advisable to use a battery control circuit (BCC) (available on eBay for example)
The BCC has two functions:
(1) Limit the maximum current that the battery will supply in case of a short circuit
(2) Disconnect the battery when the battery terminal voltage drops to a certain level due to discharge: a lithium battery may get damaged if the terminal voltage drops below a specified voltage.
Just a few points:
(1) There are a load of rip-off batteries around, so only buy main-brand batteries (Sanyo, Panasonic, Samsung, Sony, etc) from a reliable source.
(2) You say that you are going for 2,500 mA/H batteries, but 3,500 mA/H batteries are available at a reasonable price. This will heat your gloves for a proportionally longer period.
(3) The capacity of a battery is much lower at low temperatures, so if you can house the batteries in a warm area of your bike (25 deg C is is ideal) that would be an advantage, although when a battery provides power it self-heats so that will help
(4) The charger has a big impact on battery life and battery performance, so get a good smart charger and one that charges the batteries individually. As you are planning to have 4 batteries a charger with four individual charging ports is advisable.
This is just some opening info for you to consider. If you wish to go any further, maybe open a new thread.
stet