I bought (2) B-T Jr's on eBay of $19 ea. One's on my full size boat battery and the other goes on the ST4s.
The bike took about 1-2 minutes from charge to trickle (red to green light).
The boat took bout 2 hrs to go to trickle.
All you want is smething to keep them topped up. No need for a big honkin unit.
For a trickle, .75 amps is more than sufficient and that's what the cheapest Battery Tender will give you.
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