Reciprocating saws are demanding tools. Whether you’re demolishing walls, cutting through plumbing, or pruning branches, your saw drains battery power quickly and intensively. The wrong battery choice means constant recharging, loss of cutting power mid-job, and frustration on the worksite.
This guide cuts through the noise and shows you exactly which batteries deliver best performance in reciprocating saws—and why capacity and chemistry matter more than you might think.
Quick Recommendations
| Brand | Best for Demolition | Best All-Round | Budget Option |
|---|---|---|---|
| Makita 18V LXT | BL1860B (6.0Ah) | BL1850B (5.0Ah) | BL1840B (4.0Ah) |
| DeWalt 20V MAX | DCB206 (6.0Ah) | DCB205 (5.0Ah) | DCB204 (4.0Ah) |
| Milwaukee M18 | 48-11-1860 (6.0Ah) | 48-11-1850 (5.0Ah) | 48-11-1840 (4.0Ah) |
Starter packs by platform
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Which batteries fit which tools — cross-brand, adapters & Ah, decoded.
Why Battery Choice Matters for Reciprocating Saws
Reciprocating saws are one of the highest-draw cordless tools you’ll use. Unlike drills or impact drivers that operate in bursts, recip saws demand sustained, heavy current draw—especially during tough demolition work where the blade is under constant pressure cutting through wood, metal, or concrete.
What happens with the wrong battery:
- Compact 2.0Ah or 3.0Ah batteries hold less charge, so they run down sooner on a sustained-draw tool
- Larger packs add weight, which matters overhead or at arm’s length
- You will swap batteries more often on demolition jobs
- Smaller batteries heat up faster under sustained load
Why capacity and chemistry matter:
- Capacity (Ah): a 6.0Ah battery holds three times the charge of a 2.0Ah pack, so expect roughly three times the cutting between charges in the same saw. The makers do not publish reciprocating-saw runtimes for these batteries, and we have not tested them.
- Cell chemistry: Modern 18V/20V lithium-ion batteries hold voltage much better under load than older NiCd or NiMH. This means consistent cutting power throughout the battery’s discharge
- Thermal management: maker packs include protection electronics; Makita, for example, says its Star Protection guards against overload, over-discharge and overheating.
Makita 18V LXT Batteries for Reciprocating Saws
Makita describes its 18V LXT system as the world’s largest compatible 18V slide-style battery ecosystem, and LXT reciprocating saws such as the DJR186 reciprocating saw take any LXT pack.
BL1860B (6.0Ah) — Best for Demolition
The 6.0Ah is the choice for heavy demolition work: it holds 20% more charge than the 5.0Ah for almost the same weight (Makita UK: 0.66 kg against 0.63 kg). The makers do not publish reciprocating-saw runtimes for these batteries, and we have not tested them.
BL1850B (5.0Ah) — Best All-Round
The 5.0Ah strikes the best balance between runtime and weight. Perfect for mixed work—demolition, plumbing cuts, tree pruning—where you don’t need maximum endurance but want to avoid constant battery swaps. Most users find this the sweet spot for professional and serious DIY use.
Learn more about Makita 18V LXT battery compatibility.
BL1840B (4.0Ah) — Light Pruning & Plumbing
Acceptable for lighter work like branch cutting or a handful of plumbing cuts. Runs out faster on demolition work but fine for occasional use. Good budget entry point if you’re already invested in 18V LXT.
DeWalt 20V MAX Batteries for Reciprocating Saws
DeWalt’s 20V MAX platform offers strong performance in the DCS380 reciprocating saw. Note: DeWalt also offers FLEXVOLT batteries (20V/60V convertible), but standard 20V MAX is the primary compatibility option. See our DeWalt 20V MAX and FLEXVOLT compatibility guide for more detail.
DCB206 (6.0Ah) — Best for Demolition
The 6.0Ah DCB206 holds 20% more charge than the DCB205 for long demolition sessions. DeWalt’s 20V MAX is 18V nominal — the same as Makita and Milwaukee 18V — so the label is not a power advantage. A popular choice on professional jobsites.
DCB205 (5.0Ah) — Best All-Round
The 5.0Ah balances runtime and weight (DeWalt US lists 1.54 lb, against 2.25 lb for the DCB206). In the UK the same platform is sold as 18V XR, where the DCB184 5.0Ah is the equivalent pack.
Learn more about DeWalt 20V MAX battery compatibility.
DCB204 (4.0Ah) — Light Pruning & Plumbing
Suitable for occasional lighter cutting such as plumbing and branch work; not the best choice for extended demolition.
Milwaukee M18 Batteries for Reciprocating Saws
Milwaukee’s M18 FUEL platform includes the 2821-20 SAWZALL reciprocating saw, one of the most recognized recip saws in professional circles. M18 batteries are known for excellent performance under sustained load.
48-11-1860 (6.0Ah) — Best for Demolition
The 48-11-1860 is the M18 REDLITHIUM XC6.0, Milwaukee’s standard 6.0Ah pack — not a HIGH OUTPUT pack. Milwaukee’s HIGH OUTPUT XC6.0 is the 48-11-1865, which Milwaukee says delivers 50% more power and runs 50% cooler than its XC packs; that is the one aimed at high-demand tools such as FUEL saws.
View Milwaukee 48-11-1860 on Amazon
48-11-1850 (5.0Ah) — Best All-Round
The 5.0Ah is widely considered the “daily driver” for Milwaukee M18 users. Good balance of power, runtime, and weight. Works excellently with the M18 FUEL SAWZALL across all job types from plumbing to light demolition.
Learn more about Milwaukee M18 battery compatibility. Also see our Milwaukee M12 vs M18 battery guide if you’re comparing platforms.
View Milwaukee 48-11-1850 on Amazon
48-11-1840 (4.0Ah) — Light Pruning & Plumbing
Suitable for lighter cutting tasks. The M18 platform handles lighter work well, but if you’re doing this regularly, step up to a 5.0Ah or 6.0Ah for better practicality.
View Milwaukee 48-11-1840 on Amazon
Complete Battery Comparison Table
| Brand & Model | Capacity | Nominal Voltage | Suggested use | Price Tier |
|---|---|---|---|---|
| Makita BL1860B | 6.0Ah | 18V | Demolition, all-day work | Mid–High |
| Makita BL1850B | 5.0Ah | 18V | Mixed work | Mid |
| Makita BL1840B | 4.0Ah | 18V | Light cutting | Budget–Mid |
| DeWalt DCB206 | 6.0Ah | 18V (20V max) | Demolition, all-day work | Mid–High |
| DeWalt DCB205 | 5.0Ah | 18V (20V max) | Mixed work | Mid |
| DeWalt DCB204 | 4.0Ah | 18V (20V max) | Light cutting | Budget–Mid |
| Milwaukee 48-11-1860 (XC6.0) | 6.0Ah | 18V | Demolition, all-day work | Mid–High |
| Milwaukee 48-11-1850 (XC5.0) | 5.0Ah | 18V | Mixed work | Mid |
| Milwaukee 48-11-1840 (XC4.0) | 4.0Ah | 18V | Light cutting | Budget–Mid |
Watch: Video Guide
Frequently Asked Questions
What size battery do I need for a reciprocating saw?
For serious work — demolition, construction, tree work — use at least a 5.0Ah battery; for extended demolition (walls, metal studs), 6.0Ah is the practical choice. Smaller packs (2.0–4.0Ah) run down sooner on a sustained-draw tool. The makers do not publish reciprocating-saw runtimes for these batteries, and we have not tested them.
Can I use a compact battery in a reciprocating saw?
Technically yes, but it is not the best fit. A 2.0Ah compact pack holds a third of the charge of a 6.0Ah pack, so you will swap batteries often on demolition work. Compact packs suit drilling, fastening and lighter tools.
Is 18V or 20V better for reciprocating saws?
In practical use, the difference is minimal. DeWalt’s 20V MAX batteries have the same 18V nominal voltage as Makita and Milwaukee 18V batteries (20V is DEWALT’s maximum initial voltage), so the label is not a power advantage in itself. Choose based on which platform you already own; don’t switch systems because of the label. The bigger factor is capacity (Ah): a 5.0Ah 18V battery will outperform a 3.0Ah 20V in a recip saw.
Do I need different batteries for different materials?
No. A single 5.0Ah or 6.0Ah battery will handle wood, metal and plastic cuts. What changes is how fast it drains: hardwood or steel studs demand more sustained current than softwood or plastic, which is why capacity matters most.
What about FLEXVOLT or other multi-voltage batteries?
DeWalt’s FLEXVOLT batteries (20V/60V convertible) work in 20V MAX tools but operate in 20V mode, so they don’t offer a power advantage over standard 20V batteries. The benefit of FLEXVOLT is flexibility across multiple platforms (20V and 60V tools), not performance in a single recip saw. For recip saw use alone, standard capacity batteries are the better choice. See our DeWalt 20V MAX and FLEXVOLT compatibility guide for detailed comparison.
Summary: Choosing the Right Battery
Professional demolition work: Choose a 6.0Ah battery (BL1860B, DCB206, or 48-11-1860). The extra capacity pays for itself in reduced downtime and consistent cutting power through tough jobs.
Mixed work and serious DIY: A 5.0Ah battery (BL1850B, DCB205, or 48-11-1850) is the practical sweet spot. You’ll find the tool stays lighter and more balanced than with a 6.0Ah.
Occasional light work: A 4.0Ah is acceptable for branch cutting or a few plumbing cuts, but if you find yourself doing this regularly, invest in a 5.0Ah to eliminate frustration.
Platform choice: All three brands (Makita 18V LXT, DeWalt 20V MAX, Milwaukee M18) deliver excellent reciprocating saw performance. Choose based on which ecosystem you already own and are comfortable with. Battery capacity matters more than the platform label: all three are 18V nominal.
Ready to choose? Check out our detailed compatibility guides for Makita 18V LXT, DeWalt 20V MAX, and Milwaukee M18 to explore the full range of compatible tools.
How we compile this guide
We cross-reference compatibility details against manufacturer specifications where available, official tool manuals, and the physical standards that govern fitment (bore sizes, arbor diameters, voltage platforms, connector types). We prioritise primary sources over retailer listings, flag anything we can’t confirm, and re-verify the data on a regular cycle. Where we give a buying recommendation, we tell you the reasoning — not just the link. More on our method →
