I got back from a 10-day trip the other day. I went to start my motorcycle to just let it run... well the battery was dead. I was wondering Can I use my Car to Charge my Motorcycle Battery?
While your method is apparently working for you.....Id much rather shell out $9 for a battery tender then go out in below zero weather and cold start my bike. Not to mention the fact that unless your riding it and getting it to operating temperature your doing your bike a dis-service by letting it run a short time and then turning it back off.Your battery is probably shot though. Personally, I don't own a battery tender. I've never pulled the battery while storing the bike for winter. I'll start it maybe once or twice during the winter months and have never had a problem. For me, if I need a tender, I need a new battery.
Motorcycle batteries in alot of cases are shipped and set dry before sale.Just replaced the factory battery in my 1999 A.C.E. and it never saw a tender. Don't think I ever saw a tender on the batteries waiting to be sold either. Just sayin.