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If the maintainer is used consistently, battery life will be maintained and usually life is extended. If the battery has gone through deep discharge for a long time, it "may" have lost some of its original service life (~5 years minimum.)
I think you might be right GMan about it reviving a dead battery. There are two reasons car batteries go bad. One is if a cell goes bad. The other is due to a buildup of a coating that covers the lead plates. As the coating builds, the battery has a harder time holding a charge. The pulse charging is suppose to break up the coating and revive a dead battery or not cause anymore plating "growth" while it is charging your battery.
Daryl is right. Once the plates start sulfating, the battery goes downhill as it blocks the chemical reaction that creates the electrical current. The pulsing action of the charge helps to break loose the coated plates and allows it to revive. This type of charging is also better than the typical charger that just keeps a constant power level on the battery and it heats up and allows the sulfation to occur.
However, having said all of that, I'm not familiar with this particular product.
Hi guys just bought my 4th ES300h car yesterday for $6000 anf it got 274k miles on it but check hybrid code came up after i drive it from Dallas TX to Philly PA 1600 miles and my dashbiard light up like a Christmas tree.
Checked with Techstream and reset code runs normal again for now. . Lets see how long it can last. I know car does run on default and gas engine when kight was on smart engineering.
I know the systrm can go over 500k plus mikes i have seen in Camrys and Avalons too.
Congrats on your new purchase. You really need to ask your question in the ES section of this website. Since our systems are so different, I wouldn't trust any information we gave you. https://www.clublexus.com/forums/lexus-model-forums-1/