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Milwaukee M12 4Ah battery prices

Every genuine Milwaukee M12 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$11.25
Cheapest used, per Ah$5.75
Cheapest single battery$22.99
Condition
$/AhPrice ShippingAhWh $/WhPartCondition Listing
$5.75$22.99free448$0.4848-11-2440UsedMilwaukee 48-11-2440 M12 12V M12 Battery
$7.69$30.75free448$0.64UsedMilwaukee M12 REDLITHIUM XC 4.0 12V Li-Ion Battery Pack 4Ah RedHigh output
$7.81$31.25free448$0.65UsedMilwaukee M12 REDLITHIUM XC 4.0 12V Li-Ion Battery Pack 4Ah RedHigh output
$9.50$37.99free448$0.79UsedMilwaukee M12 12-Volt Lithium-Ion XC Extended Capacity Battery Pack 4.0Ah
$9.75$39.00free448$0.8148-11-2440UsedMilwaukee 48-11-2440 M12 REDLITHIUM XC 4.0 Extended Capacity Battery PackHigh output
$10.84$43.34$6.57448$0.9048-11-2440Used✅Milwaukee M12 REDLITHIUM XC4.0 Extended Capacity Lithium-Ion Battery 48-11-2440High output
$11.25$44.99$5.99448$0.9448-11-2440Open boxMilwaukee 48-11-2440 M12 REDLITHIUM XC 4.0 Extended Capacity Battery Pack - 1pcsHigh output
$11.25$37.00+ ship448$0.94UsedMilwaukee M12 REDLITHIUM XC4.0 12V 4.0Ah Li-Ion Battery Pre-OwnedHigh output
$11.33$45.33free448$0.9448-11-2440NewMilwaukee 48-11-2440 M12 REDLITHIUM XC 4.0 Extended Capacity Battery PackHigh output
$11.60$46.41free448$0.9748-11-2440Open boxMilwaukee 48-11-2440 M12 REDLITHIUM XC 4.0 Ah Extended Capacity Battery PackHigh output
$11.64$46.57$6.57448$0.97Open boxMilwaukee M12 4.0 Ah RedLithium Extended Capacity Battery Pack - Red...
$12.49$49.98free448$1.0448-11-2440NewGENUINE Milwaukee OEM M12 4.0 Battery XC4.0 12V 4.0Ah 48-11-2440 RedLithiumHigh output
$12.50$49.99$5.00448$1.04Open boxMilwaukee M12 XC 4.0 ah RedLithium Extended Capacity 12V Battery Pack High output
$12.50$49.99free448$1.0448-11-2440NewGENUINE Milwaukee M12 XC4.0 RedLithium 4.0Ah Battery 48-11-2440High output
$12.50$50.00free448$1.04NewMilwaukee M12 REDLITHIUM XC4.0 4Ah 12V Li-Ion Battery Pack BlackHigh output
$13.00$51.99free448$1.0848-11-2440NewMilwaukee Single 48-11-2440 12V M12 4 Ah Battery
$13.25$45.00+ ship448$1.10NewMilwaukee M12 4.0 Ah RedLithium Extended Capacity Battery Pack - Red...
$13.36$53.44$12.95448$1.1148-11-2440UsedGENUINE Milwaukee M12 4.0 AH XC Battery 48-11-2440
$13.75$55.00$5.00448$1.1548-11-2440Open boxGENUINE Milwaukee M12 XC4.0 RedLithium 4.0Ah Battery 48-11-2440High output

Showing 19 of 19 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.