battery tender (maintainer), completely off NOT FLOAT.

[roeme]

I'm using this one here, as do many of my bike acquaintances, and one of the bike mechanics I know: https://www.ctek.com/products/vehicle/mxs-5-0. I've originally decided on it because the manual actually documents the charger's logic and important specifications.

As for keeping it connected: It will go into a light float charge, compensating for temperature (!) after a charge cycle. After 10days max, it will switch to a very light pulse/trickle charge. The voltage is monitored all the time though, and if it drops too low, the unit will automatically start a regular charge cycle.

I'd let mine connected all the time on my bikes; but since I've got my bikes in a shared parking garage, can't do that.

Pricey (I guess? 90CHF in these parts) but well worth it.

[rphillips]

Thanks roeme, This is also a float or trickle & more complex than our batt. tenders, not say'in it don't work. This just seems so simple? 1 amp. maintainer on till microprocessor sees full charge, then switch to "OFF". Sits there monitoring charge till microprocessor sees 5%, 10%, whatever it's set at, then switch back "ON" till microprocessor sees full charge again, then back "OFF". Time, temp., humidity, daylight or dark, noise level, nothing else matters, "ON" till full charge, then off till needed again. Exactly like my 10 amp. on board boat charger, that's been there, unplugged only for trips to the lake, then plugged back in when boat back in garage & stays plugged in constantly till next trip to the lake for past 12 or 15 yrs, only need smaller & less amps. It's just hard to imagine there's not one out there.