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Nice write up on these, the controller is built in to the grip.http://www.webbikeworld.com/motorcycle-heated-grip-reviews/koso-apollo-heated-grips-review/
Super helpful, and much appreciated. May try the heated glove liner route this time...
I do find that heated gloves or heated glove liners work better than heated grips for temps under 40F without any find protection, but, I'm able to get similar results with heated trips, good insulated gloves, and good hand wind shields, such as the Barkbuster Blizzards. I commute on my motorcycle, and found that using my heated gloves every day was getting hard on the wires and connectors, plus, I found it tedious to wire everything up each time I ride. The heated grips + hand guards are much more convenient.I still do use my heated gloves when riding any of my bikes w/o heated grips in colder temps. I also carry them as a backup to the heated grips in the event that they would fail for any reason.Also, one final note on heated grips, is that they're always there when the temps fall while you're out, and you don't have the heated gloves with you, or the gloves you do have with you aren't warm enough for the new temps.
I'm normally not a compulsive buyer, but after I checked these out I ordered them. I'll report back after I install them and try them out.
I know this thread's a few years old, but I've a 2016 Stornello and was glad to see 120mm Koso grips are now available in USA - https://www.jpcycles.com/product/510-2770/koso-7-8-black-apollo-heated-gripsI'm also looking at some acerbis dual road handguards to keep the chill off without ruining the look of the bike.