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 Botanic Garden >> Gardening >  >> Question and Answer >> Irrigation

Richdel 446 PR Backup Battery Overheating: Use Rechargeable 9V or Remove Battery

Battery Clip Replaced; 9V Battery Got Hot (5 V); Clock LEDs Out, Sprinklers Started

The controller works fine without a battery. Some Richdel models require a rechargeable NiCad 9 V (trickle‑charged). An alkaline battery will overheat and may damage the controller’s backup circuit.

  1. Try a NiCad 9 V rechargeable battery.
  2. If overheating persists, the controller’s backup leads are shorted—replace the controller eventually.
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