I can tell you from personal experience that AGMs won't servive either. I had 4 hooked in parallel that I flattened to 4.5 v . A painful experience. At the same time I lost my inverter charger.
Fred Hazzard S/V Fury C&C 44 Portland, Or On Jul 20, 2017 12:34 PM, "Bill Bina - gmail via CnC-List" < cnc-list@cnc-list.com> wrote: > I'm sorry to be the bearer of bad news, but if those voltages of 4.7 > volts and 5.7 volts were correct, they mean these batteries have been quite > severely damaged and will never have anywhere near full capacity again. > That is not a maybe. You can get many batteries like that to take a surface > charge and appear okay with a voltage reading that looks somewhat normal. > There is no muscle behind it. The charger is telling you they are 100% > charged to their new and very diminished capacity. Some of the cells may > also have run dry. This was not survivable for any flooded battery > regardless of quality, or how it was treated otherwise. > > Bill Bina > > On 7/20/2017 10:10 AM, RANDY via CnC-List wrote: > > An update on this. Monday morning I brought my batteries home (I've got > two of these: https://www.walmart.com/ip/EverStart-Maxx-Marine- > Battery-Group-Size-29DC/20531539 dated May/June 2014 with relatively > light use and constantly maintained by a 3amp solar charger). And I bought > this inexpensive charging unit: https://www.walmart.com/ > ip/Schumacher-Electric-15-Amp-Battery-Charger/46167057. > > One battery measured 4.7v before charging, and the other 5.7v, according > to the charger's test function. Each battery was on the charger for about > 33 hours to charge back up to 13.2v / 13.5v and 100% charge according to > the charger. I haven't measured their voltage independently after charging > with a multi-meter, but I did that at the start of the season and they were > healthy. > > > > > _______________________________________________ > > This list is supported by the generous donations of our members. If you > wish to make a contribution to offset our costs, please go to: > https://www.paypal.me/stumurray > > All Contributions are greatly appreciated! > >
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