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Replacing Group 27 Batteries with Group 34 AGM Batteries???
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Author:  90Tiger [ Sat Jun 09, 2012 9:03 am ]
Post subject:  Replacing Group 27 Batteries with Group 34 AGM Batteries???
I currently have 2 batteries in my boat (Horizon 210 bowrider w/5.0L Mercury). Both batteries are Interstate batteries (size 27M-XHD) with the specs listed below. Is there any reason I can't replace my existing batteries with Group 34 AGM batteries? I came across some Duracell AGM batteries (made be Deka/East Penn) at Sam's Club that seemed to be priced pretty well ($90 after core charge). Sam's also carries Optima marine batteries but they are about 60% more than the Duracells. The only thing that I might operate on my boat while the motor isn't running is the radio (no amp) and I can't see me running that for more than an hour at a time. Isn't an AGM battery preferable over a "regular" battery? Is there anything I should consider before doing so? Any help or advice would be appreciated.


Interstate 27M-XHD
Free Replacement: 12 months
Pro-rata Warranty: 24 months
Cranking Amps: 1000
Termination: M
Voltage: 12
Width: 6.75”
Length: 12.75”
Height: 9.50”
Weight: 54.10
Amp: 1000
Cold Cranking Amp (CCA): 800

Duracell 34MSAGM
Free Replacement: 18 months
Pro-rata Warranty: 36 months
20 amp hour rate:55
BCI Group Size:34M
CA at 32 degrees F:955
CCA at 0 degrees F:775
Reserve Capacity:120
Volts:12
Author:  ric [ Sat Jun 09, 2012 12:06 pm ]
Post subject:  Re: Replacing Group 27 Batteries with Group 34 AGM Batteries???
Two of those Duracell's doesn't even equal one of your interstates. You can, just don't blast the radio for 6 hours on your starting battery.
Author:  90Tiger [ Sat Jun 09, 2012 5:03 pm ]
Post subject:  Re: Replacing Group 27 Batteries with Group 34 AGM Batteries???
ric wrote:
Two of those Duracell's doesn't even equal one of your interstates.



How do you come to that conclusion? The Duracells aren't just starting batteries. They are starting/cycling batteries. The CCAs seem relatively close (Interstate-800, Duracells-775) and the CAs are also relatively close (Interstate-1000, Duracells-955). Is there something else I'm missing?
Author:  ric [ Sat Jun 09, 2012 8:32 pm ]
Post subject:  Re: Replacing Group 27 Batteries with Group 34 AGM Batteries???
Amp hour rating is the only one to look at. That's the battery's capacity or 'size of its gas tank'
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