bhm_to
Hi
I installed the last battery almost 6 years ago, I can tell its losing the cranking power and multimeter test was 9.6. The suggest battery is 26R minimum 525 CCA. The last one was 26 540 CCA and worked well except on very cold days. In general I cant easily find a right hand battery (other than 510 CCA). I was wondering on any other suggestions for more CCA and what battery group size would fit or work, but not sure. Any suggestions would be appreciated.  Model 0055251, Generac propane air cooled 20Kw installed around 2008.

thanks
brad
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BillM

Give Walmart a check to see if they have it.  My local Walmarts actually stock the battery.  I have mine on a 4 year replacement, but actually replaced it at the 2 year mark before I wised up a bit.  I live in Wisconsin, we have cold winters and have had no issues.

 

26R Battery.jpg 

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grsthegreat
Napa carries them, and 26r is standard everywhere’s as far as I know. I buy mine directly thru generac, 10 at a time. They are exide units and I’ve had great luck with them. Ive had a few customers complain to me that Walmart batteries only lasted a few years...like 2 years. Generally I can get 6 years from the Exide’s, but suggest 5 year rotation.
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DenisC
I use the same Walmart battery referenced by BillM.  I’ve replaced them every 4 years even though the load test they run in the auto center says the battery is fine.  I live in upstate NY and it gets very cold here as well.  Battery has always worked and is a great value.
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10kray
I never had a problem getting the 26R from Walmart either. In fact we've replaced ours about three times over the years. They say every three years you should replace the battery, don't wait for trouble !
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Dick from Canada
The 26R battery should be no problem from Walmart. Their batteries are made by Exide or Delphi . These are a flooded cell battery and their electrolyte level should be checked yearly. Use distilled water to top them up if need be. Plates should be covered. You said that your voltage was only  9.6V, should be about 14.2V. You may have a charger problem.  If the battery is low do you not get a " low batt alarm" ?     Four to Five year replacement is a good idea as these batteries do very little work and are under constant charge.  540 CC should do the job . A agm battery will give you higher starting amps as they have very low internal resistance. More money , flooded cell should work just fine.
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grsthegreat
johnson controls makes walmart batteries, not exide
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Geoff Z
4-5 years on any sealed battery is too long with the old school trickle charger style generators. You run a sever risk of cracking it and making a mess. The new smart chargers are allowing additional life. We feel our Deka batteries can go that length with a smart charger. We have not had any of our customers make 4-5 years on their Walmart battery. However I'm sure they too are responding better to the smart chargers.
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bhm_to
Thanks everybody, never even thought of Walmart, being from Canada, Canadian Tire is almost a religion up here and is my usual go to place for simple automotive parts, plus I get a discount.  Reading all the comments sounds like I am lucky to be getting 6 years out of the one I am have and will go buy the same, its not that hard with the left side to install/remove and I only do it every 5 years. Will ask about right side when I pick one up tomorrow. Changed charger and controller around 6 or 7 years ago. No battery alarm message, I do get the standard maintenance prompt to check it.
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Gray
I use a Odyssey Model PC1200MJT

It is a Group 26R equivalent (7.87 x 6.66 x 6.80), 540 Cold Cranking Amps, 1200 Pulse (5-second) Hot Cranking Amps, and 78 Reserve Capacity Minutes. [_AC_SL1500_] 
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Lakee911
FWIW, I have an Exide in my unit going strong now for 5.6 years (since my unit was new). Zero problems. Always starts. Always shows a good voltage. I's 14.2V now, charging.  I had never even heard of Exide but Menards had them at a good price so I gave it a try.

I know I'm on borrowed time but I'll change it out at the first sign of trouble.
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Jim Z
Wow, all this wondering whether to replace batteries after 5-6 years?
I've come to believe that 3 years is an average age for most motor-starting applications.
Cars, trucks, lawn mowers, gensets.  Anything beyond 3 yrs is a bonus!
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3Phase
On air cooled units, whats the way to use a smart charger?  Disable the existing charger procedure?
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78buckshot
The newer air-cooled have a temperature compensated charger - that would be the models with a Nexus or Evolution controller. Models prior to that did have overcharge issues. Generator batteries have a pretty easy life, only asked to start the engine once a week or during occasional outages AND it's always being charged. Compare this to the battery in your vehicle or other equipment - my personal pick-up trucks can sit for a week or more without being started and the computer slowly draining the battery - hot summer - cold winter - no trickle charge. I have had original equipment Delco batteries run me 10 years, just saying. It's good to be proactive with regular battery care but it ain't rocket science.
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Cobranut

Gray wrote:
I use a Odyssey Model PC1200MJT

It is a Group 26R equivalent (7.87 x 6.66 x 6.80), 540 Cold Cranking Amps, 1200 Pulse (5-second) Hot Cranking Amps, and 78 Reserve Capacity Minutes. [_AC_SL1500_] 


I have these in several vehicles, and have always had good service, up to 11 years, from Odyssey batteries. 

When my Protector diesel needs a battery, it will be one of these.

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Kaos
Jim Z wrote:
Wow, all this wondering whether to replace batteries after 5-6 years?
I've come to believe that 3 years is an average age for most motor-starting applications.
Cars, trucks, lawn mowers, gensets.  Anything beyond 3 yrs is a bonus!


I agree! Anything over 3 is a bonus.
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george6488
Wise old man says "Battery over 3 years old will fail at most inopportune time when urgently needed"
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Birken Vogt
Yes, we don't wait for them to fail or give trouble before replacing.  Generator battery has to work perfectly when called upon, when the chips are down nobody will be around to help you get it started immediately.
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