Optimate III Deep Discharge Howto

Symptom

Optimate III when connected to the battery, lit only the power LED, none of the four status lights.

Reason

Optimate III won’t even try charging a battery if the voltage left is < 2V (what’s called a deep discharge).

Fix

  • Disconnect the battery from the bike (to prevent damage to the electronics)
  • Hook the charger up to a working battery
  • Quickly move the cables from the fresh battery to the “dead” one. If the charging light goes out before the charger gets reconnected, you’re too slow.
  • Wait patiently
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