[PSUBS-MAILIST] agm battery

[Alan James via Personal_Submersibles]

Hank,yes it worked well, but it was for inside an ambient sub, so it didn't see water.I took the top off the battery & replaced it with acrylic & took the cell valves off.http://www.psubs.org/projects/1235435392/ambientsub/I added 2 one way 3psi cracking pressure valves; one operating one way & the other the opposite way. The internals of the battery are supposed to be pressurizedat between 1 & 6psi to reabsorb gasses, so the 2 valves maintain that internal pressure.One valve lets air in at over 3psi when descending & the other lets the pressure out whileascending. I filled it with mineral oil, exposure to oxygen will degrade the battery.I did think of a better way that avoided the acrylic plate, but it would depend on thetype of AGM battery.Deep Sea Power & light have an AGM total ocean depth sea battery.I believe they take the valves off the battery cells & fill with mineral oil & place in a batterybox also filled with mineral oil. Over the top is clamped a clear flexible diaphragm that has a fill / drain valve in it. You need to release any gasses that may build up, mainly whilecharging. If you go on their site you will get an idea. http://www.deepsea.com/wp-content/uploads/SeaBattery_Specifications.pdfThere are specs & manuals.My battery is still holding a charge years later, so doesn't mind the mineral oil.Just make sure it's pure mineral oil.Cheers Alan

      From: hank pronk via Personal_Submersibles <personal_submersibles at psubs.org>
 To: Personal Submersibles General Discussion <personal_submersibles at psubs.org> 
 Sent: Wednesday, April 6, 2016 10:42 AM
 Subject: [PSUBS-MAILIST] agm battery
   
Alan,Did you successfully make a deep sea AGM battery?    I realize they are pressurized but can I drill and fill with oil then put a spring loaded pressure compensator  into the drilled hole to create the internal pressure.  So the battery would have a constant pressure inside at the surface then it increases as the battery dives to match water pressure.  Will that work?  I would like to move my AGM's  to the outside of Elementary 3000.Hank
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