Well, IMHO, a lot depends on what types of rides you'll be going on, along with the weather protection of the bike.
I do a fair amount of touring, mostly because I have kids 800 and 1,800 miles away. I got tired years ago of trying to decide -- especially in the spring and fall -- whether to wear a bulky three-quarter-length all-weather jacket, or a mesh jacket, or wear one and pack the other. Just too bulky.
The answer for me is: a mesh jacket; thin but strong, long, stretchy, well-made, and gusseted wind- and rain-proof liner (a golf item, actually); and a heated liner. This upper clothing covers me through freezing (below which I won't ride, in case of ice) to as hot as it gets. And equally important, I always wear the mesh jacket but what I may not be wearing -- including the heated liner -- packs down to almost nothing.
I described this in an article for webBikeWorld:
All-Season Motorcycle Riding Outfit - webBikeWorld .I mention all this because if you go with a heated liner, then adding heated gloves is a minor extension to this process, with connections to the sleeves.
The problem with heated grips is that they don't deal too well with the backs of your hands, and also your hands must be on the grips. If you're using cruise control, or even without it relaxing your left hand off the grip, you're not getting any heat.
OTOH, I have heated grips on my XCT, and they're nice on a chilly morning in the summer, i.e., even if you're traveling only with light-weight gloves.
So the heated grips are a nice convenience even if you're not on a major cold-weather trip. Maybe having both is best.
You don't mention what bike you own or are planning on getting. The XCT has enough weather protection that I haven't found I really need heated gloves. OTOH, I don't do many long trips when the entire day's ride will be in the 30s -- maybe just the morning.
As far as being tied to the bike, I use a Gerbings
coiled extension cord (with the male end replaced with a Powerlet male plug):
Extension Cord 90 Deg Coil 4 - Collection Gerbing Thermovelocity Protection . I have a Powerlet outlet under my left thigh, through the side cover; I detail this mod on my XCT at
Victory Powerlet in Side Cover . If I have my liner plugged in (which I often don't, because I also use it in moderate temps just as quilted insulation) and forget about it at a gas stop, the cord stretches way out before it would unplug... i.e., I'm reminded to unplug it. So, for me, being connected to the bike is not a big deal: pop in the Powerlet plug, and it's coild out of the way, no riding interference, and then easy to pop out when getting off.
That's my experience. I guess if you're doing all-day really cold-weather rides, and your bike doesn't have heated grips, I'd go with bike-powered heated gloves (and a heated liner). OTOH, if your bike has heated grips, you could probably do without heated gloves, and just wear insulated gloves, although that combination may not be quite as good. If instead you're just doing short cold-weather commutes, battery-pack gloves might be OK, although I don't have any experience with them.
You might want to look at webBikeWorld's glove page,
Motorcycle Gloves - webBikeWorld , where they even have a section of reviews of battery-pack gloves. There's a lot to read there.