Hytron 50 batteries occasionally refusing to charge despite working normally when successfully charged

Gear

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2007Batteries/Power forum

19 years old. Gear and prices may have changed since.

Clean the battery and charger contacts using a pencil eraser or sharp object to resolve charging communication issues.
Battery packs that display a HOLD status on the charger will not charge and should be removed from the charger to prevent potential safety issues.
CCO cut-off indication means the charger has stopped charging before reaching full battery capacity, resulting in approximately 25 percent less charge than maximum.
Batteries displaying HOLD or CCO status can be successfully charged using PAG or Cadex analyzers instead of smart chargers.
Some non-smart chargers struggle to initiate charging when battery voltage has dropped too low and may not properly restore the charge.
Resetting the Hytron 50 using a paperclip in the hole above the LCD panel can resolve some charging issues.
Smart chargers such as the Titan 4-port or 2704 with DDS module are more reliable across different battery types than older ABC-series chargers.
Internal damage to circuit board components, thermal sensors, or wiring inside the battery pack can prevent charging even though external contacts are clean.

The discussion does not confirm whether the original poster's specific issue was resolved.
Advice about HOLD status comes from a battery rebuilder's experience rather than manufacturer documentation.
The distinction between different cut-off modes is mentioned but not definitively explained with technical precision.
Whether the ABC800H chargers mentioned are smart or non-smart chargers is not explicitly stated in the thread.
Some claims about charger behavior with deeply depleted batteries are anecdotal observations rather than tested conclusions.