Part / accessory · RIDGID

RIDGID AC840040 18V 4.0Ah MAX Output battery

verified 2026-10-07 Specs from RIDGID product page. Also known as: ac840040.

Specs

voltage v18
capacity ah4
chemistryLi-ion

Fits

  • battery RIDGID 18V battery platform (incl. MAX Output, MAX Output EXP)
    RIDGID says its 18V batteries are '100% compatible' with all RIDGID 18V batteries, tools and chargers.

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Good to know
  • Not compatible with Ryobi ONE+ even though TTI makes both brands.
  • MAX Output and MAX Output EXP are higher-power RIDGID 18V packs, not separate platforms.

What does the RIDGID AC840040 18V 4.0Ah MAX Output battery work with?

1 models in the graph.

Informational only. Confirm with the manufacturer before buying or installing. Spotted a mistake? Report it.