They Look Like DEKA's !

claychps Registered Users Posts: 9
Hi all,
I'm afraid of the answer but I will ask it anyway. I was given (4) 8D "solar" batteries with a March 09 Date code. They look like DEKA but the label is missing. Grey container with black lid and "do not remove" caps. I don't know the history but my concern is they are sunk in around the vent caps. Almost like an internal vacuum. Am I wasting my time with these? Any tests I can do other than the timed 1amp load until 10.5v SOC?



  • n3qik
    n3qik Solar Expert Posts: 741 ✭✭
    Re: They Look Like DEKA's !

    Charge them up and do a load/time test. But NOT to 10.5 volts. They will be toast if you go that low. Run them down to 12.0 volts. This is about 50% SOC.
  • mike95490
    mike95490 Solar Expert Posts: 9,583 ✭✭✭✭✭
    Re: They Look Like DEKA's !

    What's their standing voltage before you do anything? If you are measuring 7 or 9 volts, they've sulphated, and now you get the expense of carting them to Toxic Waste.

    Charge and try.
    Powerfab top of pole PV mount | Listeroid 6/1 w/st5 gen head | XW6048 inverter/chgr | Iota 48V/15A charger | Morningstar 60A MPPT | 48V, 800A NiFe Battery (in series)| 15, Evergreen 205w "12V" PV array on pole | Midnight ePanel | Grundfos 10 SO5-9 with 3 wire Franklin Electric motor (1/2hp 240V 1ph ) on a timer for 3 hr noontime run - Runs off PV ||
    || Midnight Classic 200 | 10, Evergreen 200w in a 160VOC array ||
    || VEC1093 12V Charger | Maha C401 aa/aaa Charger | SureSine | Sunsaver MPPT 15A

    gen: ,

  • claychps
    claychps Registered Users Posts: 9
    Re: They Look Like DEKA's !

    Thank you for the answers. I'll only load test them to 12.0v as n3qik suggested. I did use the cheapo load tester we have at work, the kind that puts a couple hundred amp load for tens seconds. None of them read bad. The standing voltage was 12.8v on all of them. I'll charge them up and hopefully I'll get lucky.