Zippo hand warmers – any good ??

My wife suffers from really bad circulation and permanently has cold hands and when it’s really cold they really hurt.
Tried the disposable teabag ones and they are ok but they aren’t cheap and you need to buy loads of them and then throw loads away. The solid fuel charcoal ones make your pockets smell. The reusable ones you boil only last about an hour so looking at a zippo fuel one. Look nicely made and would make a nice little gift to her from the kids. But are they any good ? Do they give of a decent amount of heat?
My main worry is they will smell and make her jackets pockets smell like a petrol station
Thanks

Yes. Very good and highly recommended. Can smell sometimes as long as you do not overfill.

There are copies as such on ebay for aboht 7 quid and are just as good imo.

Great bit of kit imho.

surprisingly good. Hotter than charcoal stick ones, and unbelievably long lasting.

Tactile too.

Very good. Worth getting a couple of the catalytic burner bits for the top though as they can sometimes be a bit hit and miss. Zippo fuel also seems to work better.