www.iFourWinns.com

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

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.

_________________
1981 Columbia 8.7
2015 Yamaha FZR - 87mph - sold
2006 Yamaha GP1300R - sold
2003 Chaparral 215 SSI - sold
2009 Stingray 195CS - sold
2000 Four Winns H180 - sold
1976 O'day Daysailer II - sold
Rick's Four Winns H180 Mods/Upgrade Thread

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?

Amp hour rating is the only one to look at. That's the battery's capacity or 'size of its gas tank'

_________________
1981 Columbia 8.7
2015 Yamaha FZR - 87mph - sold
2006 Yamaha GP1300R - sold
2003 Chaparral 215 SSI - sold
2009 Stingray 195CS - sold
2000 Four Winns H180 - sold
1976 O'day Daysailer II - sold
Rick's Four Winns H180 Mods/Upgrade Thread