battery maintainer

Another question: I have two chargers/maintainers. The first one after connecting pretends to disulfate, charge and after it charged the battery to 100% it keeps constantly fluctuating from 13.4V to 13.55V non stop. The second one does the same but after charging the battery to 100% at ~13.5V...

Last week i bought two NOCO Genius1 chargers/maintainers. I put them on two different batteries, one is 800CCA marine and another is a small 230CCA ZT. Both batteries were fully charged before i connected NOCOs. Both chargers were blinking red light for a few seconds then went solid green. It is...

The dreaded crank but no start, with good starter rpm spin but no usual audible “click” from electrical components. Although the battery has been on a Ctek smart charger showing fully charged, I still reverted to a Noco jump pack first to just to rule out a good 12v indication but insufficient...

Good morning. Our 1960 Case 430 diesel has two 6v batteries, apparently it is 6v running 12v starting. It lives out in a shed on a lot with no power. I would like to keep the batteries up, but am unsure how to go about it. I use the little 1.5 watt solar maintainers from Horrible Fright on...