AGM batteries are pretty common in sportbikes & are actually relatively cheap on Ebay if you go for the motorcycle variety...
On Fri, Feb 13, 2015 at 8:02 PM, Mark Langford via KRnet < krnet at list.krnet.org> wrote: > Regarding the recent discussion on batteries, I should point out that the > Odyssey 680 battery is an AGM (absorbed glass mat) battery with some pretty > impressive qualities. Their main claim to fame is that they don't > "self-discharge" nearly as fast as regular lead-acid batteries, and last a > lot longer in service. They will fit in a much more compact space (see > enclosed image) although they weigh only slightly less. Also, you can mount > a typical AGM battery on its side, as I did in N56ML which gave me room to > put it on the shelf on the back side of the firewall, or even upside down. > And since it's sealed, negative G maneuvers don't matter to an AGM, and > heat isn't as detrimental either. > > I ran my Odyssey 680 for something like four years in N56ML, and then let > it sit for two years before I swapped it into N891JF. That would have > killed a conventional lawn mower battery, but the 680 still cranks N891JF > on the coldest of days. Leaving your battery on a trickle charger is no > longer required with an AGM, unless you live in Alaska. > > And of course you could buy three lawn mower batteries for the cost of an > (Odyssey or equivalent), but you'd have missed a few days of flying due to > dead battery surprises. And the total life span of an Odyssey is probably > about the same as three lawn mower batteries anyway, if not more. The > Odyssey 680 can be bought for $105 with free shipping at the link below, > while a Walmart mower battery is $39. > > I was using the KRnet search engine to look for "Odyssey" and ran across a > post that mentioned the Deka ETX201 battery. The Deka AGM is even more > powerful (20Ahr vs 16Ahr) and can be bought for $79 plus shipping (always > the wildcard), which is pretty attractive in my mind, having just spent > $105 for a new 680 that I apparently don't even need yet! > > Looking at the lawn mower battery in this photo, the mower battery has a > higher 230 CCA (cold cranking amps @ 0 degrees F) than the Odyssey's 170 > CCA, but for how many years and how long after a full charge? > > I think the user ratings of AGM batteries says a lot. The Odyssey 680 is > something like 4.75 on Amazon...not too shabby, but the Ever Green mower > battery is less than 2.5. > > But as Larry would say, "your mileage may vary"... > > Odessey 680 - > http://www.batterymart.com/p-odyssey-pc680-battery.html?gclid= > CjwKEAiA3vamBRDJ1Lfwt5Pckw4SJAAdhnk2Xu99P2b363nn1Q_ > Aqo14eCbKHU3Z1MY2UJVJ6PpVNhoCbUHw_wcB > > Deka 20 Ahr > http://www.techbatterysolutions.com/Deka-ETX20L-Battery-p/etx20l.htm? > utm_medium=cse&utm_source=shopzilla&utm_term=ETX20L > -- > Mark Langford > ML at N56ML.com > http://www.n56ml.com > > > _______________________________________________ > Search the KRnet Archives at http://tugantek.com/archmailv2-kr/search. > To UNsubscribe from KRnet, send a message to KRnet-leave at list.krnet.org > please see other KRnet info at http://www.krnet.org/info.html > see http://list.krnet.org/mailman/listinfo/krnet_list.krnet.org to change > options > >
