![]() ![]() It floats at 14.2V, too high in my opinion. If I had a choice, I would get a float charger that can be set to 13.8V.Īs I have posted elsewhere, I have a "Battery Tender", designed for motorcycle and other small lead-acid batteries in over-winter storage. This is because you will loose some water charging at higher voltage. When the engine is operating, the voltage of a completely charged automobile battery should be between 13.7-14.7 volts. Your battery is fully charged if the voltage measurement is about 12.66 volts. Be aware that temperature (yearly average) will also affect optimum float voltage.Īs far as charging the battery with an external charger, you WILL shorten the battery life charging at a higher voltage than the 13.8V the Prius system was designed for. Finally, change the voltage to DC and have a look at the result. If you can't replace it you will shorten the battery life. If you operate too high you will loose water. If you operate too low you won't shorten the battery life, you'll just get a little lower capacity in use. We're talking a few millivolts difference here, which may seem insignificant, but it can impact battery life. Each is slightly different, and then there are other differences, such as recombinant technology, which will also slightly change the optimum float voltage. I'm talking of sealed flooded lead-acid, flooded lead calcium, AGM (absorptive glass mat), and gel cell types here. In my experience, this is because the electrolyte level is low.Īs far as different chemistries, the different types of batteries do have slightly different float voltage values. It will still work for a year or two, but at least in Pearl, it shows the battery gets discharged easily, indicating less A-Hrs available. If you are seeing 13.9 it's likely the battery is getting old. Because the Prius battery is a sealed unit, with apparently no way to top up with distilled water, it's best to keep the charge voltage lower to avoid loss of water.
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