Tech Tips 3: How do I recover a deeply-discharged battery?
Many battery chargers will not recognize or charge any battery that has been discharged below 10.5 volts. In this video, we explain a few options that will recover deeply-discharged batteries, including OPTIMA batteries.
For more battery related tips or to order your own OPTIMA Battery or Charger go to http://www.optimabatteries.com/en-us/