Just last week Canadian Tire had a solar panel on sale for about $10. I have one of these on the battery for my boat motor, one for the trolling motor and one for my skid steer. Those batteries are ready to go any time I ask them. If I have a vehicle that I am not going to use for the winter, I will hang one in the side window.
On the other hand, I bought a bike in 09 that had a security system, if you didn't use it for a few weeks, the security system would drain the battery. The dealer where I bought it had installed a battery maintainer. I have used the battery maintainer any time the bike wasn't in use. The bike still has the original battery and it will start the bike any time I want.
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