Rain Jet Controller Battery Function—Optional Backup Only

With battery: Power outage → schedule preserved
Without battery: Power outage → must reprogram

Rain Jet controller battery removed—system works fine. Is it needed?

Battery Purpose

Program backup only. Maintains schedule during power outages. Controller operates normally without it.

Optional. Reinstall if desired, but not required for operation.

Irrigation: New Rain Bird System Shows "5 NOMOD": Module Not Seated; Rain Jet RJC-66 No Operation: Systematic Checks or Replace Controller; Rain Jet RJC-66 Flashing "1C/2C" Error—Relay and Wiring Check; Rain Jet Sprinkler Head Replacement—Modern Brand Substitution; Rain Jet Timer Skips Zone 5: Wire Swap Test to Isolate Controller or Valve Fault; Rain Jet Sprinkler System: Identify Controller vs. Manual Valves; Rain Jet RJC-4 Controller Error: Reset with Battery Removed; Rain Jet RJC-600 Runs 20 Seconds Instead of 20 Minutes; Replacing Obsolete Rain Jet 8800 Sprinkler Heads; Rain Jet System: Finding Compatible 1" Brass Anti-Siphon Valve

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