I've been using some heated grips I got on Amazon . They really work well for me. They just wrap around with Velcro and plug into the USB port, that's it . They sure feel good on those cold days in Michigan !!
Slip em back off when it warms up. Only $14.99 with shipping can't beat that. Make sure you get the ones with the On/off Lo / Med / Hi switch.
Have fun and ride safe.
vmax3740