Ive had one of these go funny and sit at >15V. It only puts out minimal current but it still went higher than makes sense.
OP isnt running a nuclear submarine, a data center, or a cell tower. Keeping a battery floating at 13.6V while nice in theory, is not necessary. Do you really think its a good idea to leave a long term unattended vehicle pushing 14.5V for 15 minutes a day for months on end? What exact outcome are we trying to get out of this, particularly for a hybrid where the 12v battery does little more than unlock the doors and turn on the computers/support the contactor/pre-charge operations?
Those are a good design that does float and has a thermistor that can be at the supply or remote. Decent price at Northern Tool. Id use them with confidence.
Generally agree. The noco will limit the amount of time at a higher float charge (not really necessary for the 12v hybrid battery), will keep it at near 100% SOC (based upon OCV @ temperature), and will take it up shortly when it drops down enough.
Im running these on remotely parked batteries on vehicles that I may not use for months. I am comfortable with its performance.
Batteries do dry out, they do undergo thermal runaway, and they do burn up in a very nasty way. For unsupervised long-term charging, I like the fact that the power electronics are limited to 1A, fuse set at 2A, so the maximum event would be limited or harder to induce. Ive left NOCO genius 1A in remote locations on my vehicles for over 8 months now with no issues.