It is not absolutely 100% the batteries are done for. 99% maybe, but sometimes wet cells, especially traction batteries, can take a good equalizing charge and come back to life with some capacity left. My old extra car had a short that would run the battery stone cold dead. It survived about 3 of these and still could be used as a start battery, but it had almost no reserve. Joe Coquina
From: CnC-List [mailto:cnc-list-boun...@cnc-list.com] On Behalf Of RANDY via CnC-List Sent: Thursday, July 20, 2017 7:24 PM To: cnc-list <cnc-list@cnc-list.com> Cc: RANDY <randy.staff...@comcast.net> Subject: Re: Stus-List Voltages Well, if I learned an expensive lesson, I'll just have to accept that. I checked all the cells before putting the charger on them, and they were full. After charging they are still full (even though I heard the liquid bubbling i.e. creating and venting gas toward the end of the charging period). The one battery I put back on the boat yesterday was able to start my A4 and run my electrical stuff no problem, just like normal before all this. I'll take the other down to the boat tomorrow and measure its voltage with my multimeter- it will have been at rest, disconnected, for 24+ hours by then. But I know there is a difference between instantaneous voltage and amp-hour capacity. These are deep-cycle batteries, and I cycled them very deeply :) I'll just have to monitor the situation for the rest of the season and see how bad my mistakes are going to hurt :) Cheers, Randy ________________________________ From: "Fred Hazzard via CnC-List" <cnc-list@cnc-list.com<mailto:cnc-list@cnc-list.com>> To: "cnc-list" <cnc-list@cnc-list.com<mailto:cnc-list@cnc-list.com>> Cc: "Fred Hazzard" <fshazz...@gmail.com<mailto:fshazz...@gmail.com>> Sent: Thursday, July 20, 2017 3:27:38 PM Subject: Re: Stus-List Voltages 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<mailto: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! _______________________________________________ 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!
_______________________________________________ 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!
