Makita, Bauer & Kobalt Battery Train Horns: Other Platforms Compared

If your garage shelf is full of Makita®, Ridgid®, Bauer®, Kobalt®, or Craftsman® packs, you do not have to buy into a new battery system to get a portable train horn. Battery train horns for those platforms exist, but the lineup, the spec sheets, and the voltage labels are messier than the Milwaukee®, DeWalt®, and Ryobi® versions, so it pays to read closely before you order.

Which platforms actually have a horn

The big three get the most attention, but BossHorn’s public catalog lists versions for roughly a dozen other battery platforms. Not every platform gets every tier, and that is the first thing to check. Here is the lineup as listed on BossHorn’s store on 10/21/2026, Black finish prices (Chrome and Red run $20 more):

Battery platform	Dual	Quad	Extreme Series
Makita® 18V LXT™	$195	$250	$335
Ridgid® 18V	$195	$250	$335
Bosch® 18V	$195	$250	$335
Hart® 20V	$195	$250	$335
Craftsman® 20V	$195	$250	—
Bauer® 20V	—	$250	$335
Porter-Cable® 20V	—	$250	$335
Kobalt® 24V	—	$250	—
Flex® 24V	—	$250	—
Hercules®, Worx®, Skil®, Black+Decker® 20V	—	$250	—

Two takeaways. The Quad is the universal tier — every platform on the list has one, at the same $250 Black price as the Milwaukee, DeWalt, and Ryobi Quads. And the extras that the big three get are missing here: the 2026-model Dual ($220), the 5-trumpet ($270, Milwaukee and DeWalt only), and the Boss Series ($365–$385) are not listed for any of these platforms. If you want those specific tiers, our Milwaukee vs DeWalt vs Ryobi battery train horn comparison covers them.

Voltage labels: 18V, 20V, and 24V explained

The number in the product name is the battery platform’s label, not a loudness rating. That matters because the labels are not measured the same way.

• Makita® 18V LXT™, Ridgid® 18V, Bosch® 18V — labeled by nominal voltage. Makita’s own listing for its BL1850B, for example, is simply an 18V LXT 5.0Ah pack.
• Craftsman® V20 (and DeWalt® 20V MAX) — labeled by peak voltage. Craftsman’s battery pages state that maximum initial battery voltage measured without a workload is 20 volts and nominal voltage is 18. DeWalt publishes the same disclaimer.
• Bauer®, Hart®, Hercules® and other 20V packs — sold as 20V. Harbor Freight’s Bauer battery listings say 20V; we did not find a published nominal figure on those pages, so we won’t guess one.
• Kobalt® 24V MAX and Flex® 24V — Kobalt’s battery manual lists its packs at 24V with energy ratings that match that figure, such as 24V 4.0Ah at 96Wh and 24V 6.0Ah at 144Wh.

So does a 24V Kobalt-compatible horn hit harder than an 18V Makita-compatible one? Not on paper. BossHorn’s technical-spec table lists the same 140 dB max output, four aluminum-alloy trumpets, 4 lb weight, and 14 x 6 x 12 inch footprint for the Makita, Ridgid, Craftsman, Bauer, and Kobalt Quads. Each horn is built around its own platform’s battery, so the label on the pack tells you what fits, not what it sounds like.

Read the spec table, not the headline

This is where the less-common platforms get messy. The marketing copy on several of these product pages contradicts the technical-spec table further down the same page:

• Kobalt® Quad: description says 130 dB; spec table says 140 dB.
• Bauer® Quad: headline says 130 dB, the feature list says 150 dB, and the spec table says 140 dB. The description also mentions 18V batteries even though the product and spec table say Bauer® 20V.
• Ridgid® and Craftsman® Quads: headline 150 dB; spec table 140 dB.
• Makita® Dual: intro says 130 dB, feature bullet says 150 dB.
• Flex® Quad: titled for 24V batteries, but the description says Flex 20V batteries.
• Remote range: the spec table says 160 ft standard (2,000 ft optional), while the comparison chart on the same pages says 300 ft.

None of the dB figures come with a test distance, so treat them all as manufacturer claims. Our rule of thumb: plan around the spec-table number and the lower remote range, and if a voltage detail conflicts (Flex, Bauer), confirm with the seller before you order. For why an unqualified “150 dB” rarely survives a meter, see our breakdown of advertised vs real-world decibels.

Runtime and protection are the same across platforms

The good news: the battery-side specs are identical across every platform page we checked, Makita through Kobalt.

Compatible packs

2.0–12.0Ah, genuine or aftermarket same-platform packs

Runtime (6Ah)

500+ short blasts / 200 sustained

Battery cutoff

Auto-cutoff at 15%

Overheat

Auto shut-off at 185°F

Water

Splash-resistant, not waterproof

Warranty

1 year

Because blast count is quoted per amp-hour rather than per volt, the practical runtime question is simply which pack size you already own. A 2.0Ah compact pack keeps the horn light but runs out first; a 6.0Ah or larger pack is the one the 500-blast figure is based on. If you plan winter use, size up: Battery University notes that a lithium pack delivering full capacity at 80°F typically delivers only about half at 0°F. For the mechanics of how the on-board pump draws from the pack, see our explainer on how portable drill-battery train horns work.

Platform-by-platform buying notes

• Makita® 18V LXT™: the fullest lineup outside the big three — Dual, Quad, and Extreme. The Quad page specifically lists any 18V LXT-compatible pack from 2.0Ah to 12.0Ah. Our Makita-compatible Quad review goes deeper on that unit.
• Ridgid® 18V: also Dual, Quad, and Extreme. Ridgid states its 18V packs are compatible with all Ridgid 18V tools and chargers, and BossHorn’s Ridgid pages list any 18V Ridgid-compatible pack.
• Bauer® 20V: Quad and Extreme only, no Dual. Watch the 130/140/150 dB and 18V/20V contradictions on the Quad page.
• Craftsman® 20V: Dual and Quad, no Extreme Series listed — so if you want the 150 dB-claimed Extreme tier, this platform can’t get it.
• Kobalt® 24V: Quad only. Same $250 price and same 140 dB spec-table rating as the 18V and 20V Quads.
• Bosch®, Hart®, Porter-Cable®, Flex®, Hercules®, Worx®, Skil®, Black+Decker®: all have at least a Quad; Bosch, Hart and Porter-Cable add an Extreme.

Do not try to bridge platforms with a third-party battery adapter. BossHorn’s spec tables list native-platform and same-platform aftermarket packs only, and an adapter adds a connection the horn was never rated for.

No compatible battery? The math changes

If you own none of these platforms, buying a horn plus a pack plus a charger adds up. BossHorn sells its own compatible 2Ah packs and chargers at $30 each, so a Quad with both lands around $310 Black. At that point, compare a horn that ships with its own power: HornBlasters’ Drill Horn includes a 21V lithium-ion battery, charger, and remote for $179.99 on sale ($279.99 regular). The trade-off is two trumpets, an “around 125 dB up close” claim, and a battery that HornBlasters doesn’t say works with any tool platform. Our HornBlaster Drill Horn review covers it in full.

And if you want sustained, tank-fed blasts rather than pump-fed bursts, a handheld is the wrong tool entirely. Our guides to tankless train horns and air-tank vs battery horns explain where each design wins.

Keep reading

• Portable train horns: how drill-battery models really work
• Milwaukee M18 vs DeWalt 20V vs Ryobi 18V battery train horns
• Tankless train horns explained: no-tank vs onboard-air kits
• BossHorn Quad Train Horn for Makita® 18V Battery review
• Air-tank vs battery-powered train horns compared

Sources

• BossHorn — public product catalog (JSON) — full platform lineup and Black/Chrome/Red prices for Dual, Quad, Extreme, 2026 Dual, 5-trumpet and Boss Series tiers; $30 compatible batteries and chargers (checked 10/21/2026)
• BossHorn — Quad Train Horn for Makita® 18V Battery — 140 dB spec-table rating, 4 aluminum-alloy trumpets, 4 lb, 14 x 6 x 12 in, 2.0–12.0Ah 18V LXT and aftermarket compatibility, 500+/200 blasts on 6Ah, 15% cutoff, 185°F shutoff, splash-resistant, 160 ft vs 300 ft remote listings, 1-year warranty
• BossHorn — Quad Train Horn for Kobalt® 24V Battery — 130 dB description vs 140 dB spec table, 24V 2.0–12.0Ah compatibility, identical runtime and protection specs
• BossHorn — Quad Train Horn for Bauer® 20V Battery — 130 dB headline, 150 dB feature list, 140 dB spec table, 18V wording vs Bauer 20V platform listing
• BossHorn — Quad Train Horn for Ridgid® 18V Battery — 150 dB headline vs 140 dB spec table, 18V Ridgid-compatible pack listing
• BossHorn — Quad Train Horn for Craftsman® 20V Battery — 150 dB headline vs 140 dB spec table, Craftsman 20V compatibility
• BossHorn — Dual Train Horn for Makita® 18V Battery — 130 dB intro vs 150 dB feature bullet
• BossHorn — Quad Train Horn for Flex® 24V Battery — 24V product title vs “Flex 20V batteries” description wording
• BossHorn — Extreme Series Train Horn for Makita® 18V Battery — 150 dB claim for the Extreme tier, 160 ft remote with 2,000 ft upgrade
• Makita — BL1850B 18V LXT 5.0Ah Battery — Makita 18V LXT battery labeling
• RIDGID — 18V Lithium-Ion 4 Ah Battery — Ridgid 18V packs compatible with all Ridgid 18V tools and chargers
• CRAFTSMAN — V20 6.0Ah Battery (CMCB206) — disclaimer that maximum initial voltage without workload is 20 volts and nominal voltage is 18
• DEWALT — 20V MAX System — same 20V max / 18V nominal disclaimer
• Kobalt 24V MAX battery manual (Lowe’s) — Kobalt packs listed at 24V with 96Wh (4.0Ah) and 144Wh (6.0Ah) energy ratings
• Harbor Freight — Bauer 20V 3Ah Battery — Bauer packs sold under a 20V label
• HornBlasters — Drill Horn product feed (JSON) — $179.99 sale / $279.99 regular, 21V battery and charger included, “around 125 dB up close”, two metal trumpets, 100-yard remote
• Battery University — BU-502: Discharging at High and Low Temperatures — a pack at full capacity at 80°F delivering about 50% at 0°F