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Milwaukee M18 4Ah battery prices

Every genuine Milwaukee M18 4Ah battery listing we found on eBay, single batteries and multi-packs, ranked by price per amp-hour including shipping. Updated Oct 11, 2026 15:16 UTC.

Cheapest new, per Ah$11.75

Cheapest used, per Ah$8.12

Cheapest single battery$32.47

$/Ah	Price	Shipping	Ah	Wh	$/Wh	Part	Condition	Listing
$8.12	$32.47	free	4	72	$0.45	48-11-1840	Used	Milwaukee M18 REDLITHIUM XC 4.0Ah 18V Battery Pack 48-11-1840 - Black/RedHigh output
$9.75	$39.00	free	4	72	$0.54	48-11-1840	Used	MILWAUKEE 48-11-1840 M18 4.0AH LI-ION BATTERY (B26010661)
$10.04	$40.14	free	4	72	$0.56		Used	Milwaukee M18 RedLithium XC 4.0Ah 18V Battery Pack, Black/RedHigh output
$10.63	$42.54	free	4	72	$0.59		Used	Milwaukee M18 RedLithium XC 4.0Ah 18V Battery Pack, Black/RedHigh output
$10.75	$43.00	free	4	72	$0.60	48-11-1840	Used	Milwaukee M18 REDLITHIUM XC 4.0Ah 18V Battery Pack 48-11-1840 - Black/Red - UsedHigh output
$11.25	$45.00	free	4	72	$0.62	48-11-1840	Used	Milwaukee 48-11-1840 M18 Red Lithium XC 4.0Ah BatteryHigh output
$11.42	$45.69	$6.50	4	72	$0.63	48-11-1840	Used	Milwaukee M18 Red Lithium XC 4.0 Extended Capacity 4Ah Battery 2018 48-11-1840High output · 2 available
$11.50	$38.00	+ ship	4	72	$0.64	48-11-1840	Used	Milwaukee M18™ REDLITHIUM™ XC 4.0 Extended Capacity Battery Model: 48-11-1840High output
$11.75	$46.99	free	4	72	$0.65	48-11-1840	Open box	Milwaukee 48-11-1840 M18 Battery XC4.0 Red LithiumHigh output
$12.03	$48.13	free	4	72	$0.67		Used	Milwaukee M18 RedLithium XC 4.0Ah 18V Battery Pack, Black/RedHigh output
$12.12	$48.48	free	4	72	$0.67		Used	Milwaukee M18 RedLithium XC 4.0Ah 18V Battery Pack, Black/RedHigh output · 2 available
$12.25	$49.00	free	4	72	$0.68		Used	MILWAUKEE M18 4.0AH BATTERY PACK (G29027875)
$12.27	$49.08	$11.99	4	72	$0.68	48-11-1840	Used	Milwaukee M18 RED LITHIUM XC 4.0 Battery Pack 18V 4.0Ah 72Wh 48-11-1840High output
$12.49	$49.95	free	4	72	$0.69	48-11-1840	New	Milwaukee M18 4.0 Ah XC Battery 48-11-1840 GENUINE
$12.50	$49.99	free	4	72	$0.69	48-11-1840	Used	Milwaukee Model 48-11-1840 M18 Xc 4.0 AH Battery Pack 18VHigh output · 3 available
$12.79	$51.15	free	4	72	$0.71	48-11-1840	Open box	Milwaukee M18 4.0 Ah Lithium-Ion XC Extended Capacity Battery Pack 48-11-1840
$13.38	$53.53	free	4	72	$0.74	48-11-1840	New	Milwaukee M18 18V RedLithium XC 4.0Ah Battery 48-11-1840 Black/RedHigh output
$13.75	$54.99	free	4	72	$0.76	48-11-1840	Open box	Genuine Milwaukee M18 REDLITHIUM XC4.0 4Ah Battery 48-11-1840High output
$13.75	$55.00	$5.00	4	72	$0.76	48-11-1840	Open box	Milwaukee M18 18V 4.0Ah XC REDLITHIUM Lithium-Ion Battery 48-11-1840 OEM
$13.75	$55.00	free	4	72	$0.76	48-11-1840	New	Genuine Milwaukee M18 4.0 Ah Battery XC Red Lithium 48-11-1840 NEW
$14.25	$48.99	+ ship	4	72	$0.79	48-11-1840	Open box	Milwaukee 48-11-1840 M18 XC 4.0 Ext Capacity Battery Genuine MIL (FREE SHIPPING)High output
$14.69	$58.76	$12.88	4	72	$0.82	48-11-1840	Open box	Genuine Milwaukee M18 4.0 Ah Battery XC Red Lithium 48-11-1840 NEW
$14.75	$58.99	$9.00	4	72	$0.82	48-11-1840	Used	Milwaukee M18™ REDLITHIUM™ XC 4.0 Extended Capacity Battery Model: 48-11-1840High output
$15.00	$51.99	+ ship	4	72	$0.83	48-11-1840	New	Milwaukee M18 REDLITHIUM XC4.0 4.0Ah 18V Li-Ion Battery 48-11-1840High output
$16.25	$65.00	free	4	72	$0.90	48-11-1840	Used	Milwaukee M18 REDLITHIUM XC 4.0 18V 4Ah Li-Ion Battery Pack 48-11-1840High output
$17.50	$69.99	$9.99	4	72	$0.97		Used	Milwaukee Tools M18 Red Lithium XC4.0 18V 4.0Ah Battery (P03071407)High output
$19.00	$75.99	free	4	72	$1.06		Open box	CERTIFIED WARRANTY Milwaukee 48-11-1840Â 18V M18 Redlithium 4.0Ah Battery Pack
$20.00	$79.99	free	4	72	$1.11	48-11-1840	Used	Milwaukee M18 18V Li-Ion XC Extended Capacity 4.0 Ah Battery Pack - 48-11-1840
$21.11	$84.45	free	4	72	$1.17	48-11-1840	Open box	2 New Milwaukee 48-11-1840 M18 18V 18 Volt XC 4.0Ah Red Lithium Ion BatteriesHigh output
$21.50	$85.99	free	4	72	$1.19	48-11-1840	Open box	Milwaukee M18 XC 4.0 Ah Battery # 48-11-1840High output
$21.98	$87.90	$12.90	4	72	$1.22	48-11-1840	Used	MILWAUKEE TOOLS 48-11-1840 MILWAUKEE M18 4.0AH BATTERY PACK (MGP054588)
$22.20	$88.79	$8.80	4	72	$1.23	48-11-1840	New	Genuine Milwaukee 48-11-1840 M18 18V Red Lithium XC 4.0 Ah Lithium Ion BatteryHigh output

Showing 32 of 32 listings

Buying tips

Only genuine batteries are listed: we drop "for DeWalt / compatible / replacement" packs, whose stated capacity is often far above the real one, and capacities the maker does not sell for that platform. Within one platform the price per Ah is a fair comparison; across platforms compare the price per Wh, because an Ah of a 12V pack holds less energy than an Ah of an 18V or 40V pack. High-output packs (Milwaukee High Output and Forge, DeWalt PowerStack, FlexVolt, Ryobi HP) deliver more power to demanding tools at a higher price per Ah.

How this table works

We collect Buy It Now listings from eBay US several times a day in the Power Tool Batteries category, filtered by the maker's brand and voltage, and divide the total price, including shipping, by the amp-hours (multi-packs by their total). FlexVolt packs are counted at their 20V rating. We remove chargers, kits with tools, adapters, holders, empty cases, dead or untested packs, aftermarket "compatible" batteries and offers far below every other listing.