![]() ![]() With so many vehicles with different types and size of batteries on 24/7 float chargers, I did a lot of research to find out what is the best charging and float voltage for each type.įor a regular lead flooded battery, the maximum voltage, not to exceed 48 hours is between 2.35 to 2.45 per cell or 13.8 to 14.7 V. They are float charger, no trickle, meaning that once the battery reach about 13.2 to 13.5V (depending on the model) the voltage will not go higher and the amps will taper off to keep the battery fully charged without over-charging. The size of the wires from the electronic control to the alligator clips is small because the amperage is very low ( about 1/2 amp) so, no need for bigger ones. The 2nd version used a fixed value resistor for the same purpose ( about 13.5) and the latest version has a lower maximum voltage of about 13.2V which is not high enought for optima type battery than require about 13.5 to 13.8V.Īs Steve was mentionning, it's a pretty simple technology and I have changed the resistor on some of them to have a max voltage of 13.6V. The all look the same but my oldest ones have a rehostat (spel) inside than you can adjust to change the voltage. ![]() If we could top off the Delco Professional Series "maintenance free" batteries when necessary we might avoid having to buy another expensive $150 replacement battery before it's time just because it is low on water.I have about 20 of them in 24/7 use for at least the last 10 years or so on a bunch a differenty vehicles, from my GTS to my bikes, tractor, jaguar, trailer, trucks, generators, etc, with no problem save for a couple that went bad ( not charging anymore) after 7/8 years. ![]() I use a Battery Tender 24/7 because the Corvette is mostly a toy and I don't drive it enough to keep the battery charged. Does anyone know if this part of the top can be removed somehow? Can the glue be cut with an Exacto knife? I assume if I could get this part of the top off I would have access to the cells to check electrolyte levels. The top is made in two sections that appear to be glued on and you can see one side of the top has vents beside each handle upright. ![]() Some reportedly have caps under the sticker on top but the one I have which is pictured below does not appear to have a way to check the electrolyte level at all. I ruined two new Delco Professional Series batteries with a Battery Tender by assuming they never needed water.Īnyone know how to check and add water if necessary to a Delco Professional Series battery that does not have caps that can be removed? Anybody know how to get distilled water in one of these? Apparently they are made in several different case styles. It appears even the so-called maintenance free batteries still need to have their electrolyte levels checked periodically. Should the so-called "maintenance free" batteries be renamed "extended maintenance" batteries because don't they still use pretty much the same chemistry batteries always have? The main difference reportedly is they have more electrolyte over the plates to extend the in-service time before they will need more water added. As Bill Curlee has pointed out constant use of battery maintainers will eventually evaporate the water resulting in low electrolyte levels. ![]()
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