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18V Battery for AEG L1815R / Ridgid R840087 Australia: Knowledge Base

You roll up to a job at 7am, the impact driver’s already blinking two bars, and by smoko it’s dead. If that sounds like your AEG or Ridgid 18V power tool, the battery pack — not the tool — is almost always the culprit. Both brands share same 18V Li-ion rail, so a single replacement covers the lot.

Which Tools Does the L1840R / R840087 Pack Fit?

The 18V 4.0Ah Li-ion pack is a direct OEM-spec replacement for AEG batteries L1815R, L1820R, L1825R, L1830R, L1840R, L1850R and L1860R, plus Ridgid R840083 through R840089 and the AC-prefixed equivalents. It drops into AEG kit like BUS18LI, BSB18LI, BSS18CLI, BKS18LI and BS18GLI, and Ridgid’s 18V drills, impact drivers, grinders, recip saws and jobsite radios.

It does not fit the older 12V AEG range (BLL12C, L1215R) or 14.4V Ridgid packs. Check your old pack’s label — 18V Li-ion and any of the part numbers above, you’re set.

What to Look for in a 4.0Ah Replacement AEG L1840R Tool Battery

  • Voltage must be 18V. Anything else won’t seat in the rail and may trip the tool’s BMS.
  • Capacity: Genuine AEG 18V packs ship at 1.5–3.0Ah. A quality 4.0Ah aftermarket pack (the upgrade grade we ship from Granville, NSW) gives roughly 30–50% more cuts per charge on most AEG impact drivers.
  • Certs, cycles, AU stock: Look for CE / RoHS, a 1000+ cycle rating, and an Australian warehouse. An 18V Li-ion pack is a Class 9 dangerous good — long overseas shipping means weeks of wait and a half-charged pack arriving.

Swapping It In (Under a Minute)

Slide the release tabs, drop the old pack out, click the new A18FB4 / R840087 in. Most 4.0Ah packs ship at around 50% storage charge — top up before the first job.

Usage Tips: Make It Last on Aussie Job Sites

  • Don’t leave a spare in the back of the ute. Cabin temps in Perth and Brisbane hit 70°C+ in summer, and Li-ion cells degrade fast above 40°C.
  • Top up between jobs rather than running to 0%. Partial cycles are kinder to the chemistry.
  • Wipe the contacts with a dry cloth every few weeks. Sawdust on the rail is the #1 cause of “the tool won’t recognise the battery” calls we get.
  • If the pack swells, gets hot on the charger, or stops holding charge, stop using it.