As IdahoMtnSpyder said, removing the grip is a chore. It's also high risk since your picture seems to show the left grip which is where both grips CANbus interface is located. And if your Spyder is like mine the heater wires are routed through a thin groove in the round stub portion of the handlebar assembly. In other words, you must disassemble most of the handlebar assembly to remove the grip.
It's even nastier on the right grip which has the throttle-by-wire control. I took one look and decided to repair (the previous owner damaged the wires in the handlebar assembly) and improve my heated grips performance (by adding a variable temperature control) rather than adding my favorite Koso heated grips like I've done for my motorcycles.
A member in Australia said a friend tried several aftermarket options to replace BRP's heated grips and none were successful.
I have the Milwaukee Leather heated gloves
https://milwaukeeleather.com/product/mens-waterproof-heated-gantlet-glove-w-i-touch/ I only use the internal battery not the motorcycle for power so they keep my hands from getting cold rather than keeping my hands warm. And the aniline leather isn't waterproof but isn't uncomfortable when riding. Plus I have sweaty hands so even on dry days the gloves get moist (when is really hard on my regular leather gloves). YMMV