Smoove Posted June 1, 2012 Report Share Posted June 1, 2012 Yep, this is not uncommon with Optimas now-a-days. The red top in my Mustang typically rests at between 11.8 and 11.9 VDC. I really can't comment why this is because I'd be guessing, but this is something that I run into often. Maybe one of the battery gurus here can chime in - Nate? Scottie? My red top sits around same. With other people seeing the same low voltages on Optima's I am going to assume it has to do with the battery design. Quote 2 Team Fi 15's v1 2 DD M5's 970amps of Alt 6th order blowthroughThe truck Blowthrough build : http://www.stevemeadedesigns.com/board/topic/155555-smooves-1996-chevy-ext-cab-c1500-slow-build/The 350z build : http://www.stevemeadedesigns.com/board/topic/170694-smooves-2003-nissan-350z/ My FB page https://www.facebook.com/pages/Smooves-Car-Audio-and-performance/719746144805343 Team Fi Audio http://www.ficaraudio.com/ Link to comment Share on other sites More sharing options...
scottiej Posted June 1, 2012 Report Share Posted June 1, 2012 Charge them with an AGM compatible charger and let them sit overnight. If the voltage falls back in the 11's, they're toast. Could be from a combination of high engine heat and high charge voltage (relative to battery temp). Heat and excessive charge voltage are the #1 killer of AGM type batteries. Quote XS POWER Batteries, Chargers & Accessories 888-4XS-POWER Link to comment Share on other sites More sharing options...
n8ball2013 Posted June 1, 2012 Report Share Posted June 1, 2012 Mine float at 12.91 or greater. Thank you tottie johnson for such an awesome intellicharger Quote THERE IS NO BUILD LOG! 1998 Chevy Silverado ext cab Alpine CDA-9887 4 Team Fi 15s 2 Ampere Audio TFE 8.0 2 Ampere Audio 150.4 3 Digital Designs CS6.5 component sets Dual Mechman 370XP Elite alternators inbound! 8 XS Power d3400 6 XS power d680 Second Skin Stinger Tsunami Wiring Sky High A Real Voltmeter not a piece of shit stinger. Link to comment Share on other sites More sharing options...
Nasty1 Posted June 1, 2012 Author Report Share Posted June 1, 2012 Ok I'll get a AGM charger. Got 1 more ? Can I charge them with my amps still connected or do I need to disconnect them ? Quote 2 DC Audio lvl 4 xl 18s D .7s walled off @ 30 hz 19 cubes net 245sq in of port Sundown 3500 @ .7 Ohm Sundown 100.4 Rockford Fosgat Power Series 5.25 Dash 6.5 Kicks 8 Coaxils Doors 250 mechicman alt 1 red top under the hood 2 yellow tops in back big 3 with 1/0 knukonceptz wire 3 runs of +/- 1/0 knukonceptz wire IT LBS Link to comment Share on other sites More sharing options...
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