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maximize lead acid battery life?

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Old 04-21-2019, 08:11:07 PM
DustyBar DustyBar is offline
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Default maximize lead acid battery life?

Whats the best way to maximize a standby generator battery life? Is leaving it on a maintainer continuously damaging to it? Does it need to actually be used and discharged somewhat? The equipment will be stored in a heated garage and likely will never drop below freezing. It doesn't even need to be connected continuously.
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Old 04-21-2019, 08:53:38 PM
Thaumaturge Thaumaturge is offline
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Default Re: maximize lead acid battery life?
Best information source on the web to the best of my knowledge.
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Old 04-21-2019, 09:03:36 PM
Power Power is offline
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Default Re: maximize lead acid battery life?

I charge mine every few months. I want a battery that will hold charge and start set even days after power failure. Almost any battery will start genset if left on maintainer and used soon after power failure.

My experience has been that leaving on maintainer shortens life. Examples: UPS batteries, emergency lighting lead acid batteries. Usually dead in 5 years, fire marshal mandated replacement schedule 3 years.

It usually takes just a few minutes on maintainer to bring up to 14.2 V.
I check voltage before charging. If below 12.5, or takes over 1/2 hour to charge, I test battery because it is probably at end of life.

My starting batteries were pulled from car & suv when 5-6 years old. Car was new in 2005, suv 2006. They get tested about once a year on Onan W3S (you need a big fookin battery). I expect about 30 seconds of cranking with voltage above 11.5.
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Old 04-21-2019, 09:22:46 PM
pegasuspinto pegasuspinto is offline
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Default Re: maximize lead acid battery life?

A good quality battery maintainer won't shorten the life of the battery, baring a failure.

#1, get a quality battery. IMHO Autozone batteries are total crap and Wal-Mart not much better. Cheap batteries don't have quality construction, for instance they skimp on sealing the battery posts, causing corrosion. Napa, Interstate, and Oriely's batteries seem pretty good overall.

#2 don't overwater the battery. With a quality charger, and an indoor install, the battery should almost never need water. I've seen MORE batteries killed by too much water, then too little.

#3 don't abuse the battery. lead is soft and heavy, and if you knock the battery around or wrench on the posts, you're inviting a failure.

#4 don't bring the corrosion with you. If your old battery has bad corrosion issues, the acid seems to soak into the terminals and cables, and never really goes away. Put new cables and terminals on if you've got bad corrosion issues.

I've used these chargers for years, Kohler uses them too, so can't be too bad..
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Old 04-22-2019, 12:14:27 AM
cobbadog cobbadog is offline
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Default Re: maximize lead acid battery life?

I use a simple solar powered maintainer for my car and ride on mower (one each). These only put in a trickle Ma of a charge but so far I have not had any battery issues from either battery. One is 6 years old the other is 4 years.
I just like the idea if a tiny trickle charge running into the battery during daylight hours.
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