If your garage runs on red Craftsman® V20 packs from Lowe's, you already own the expensive half of a train horn: a modern lithium battery. A train horn built for the V20 foot clicks onto the packs you already charge every week and turns them into a 130–140 dB blast — no compressor, no air tank, no wiring. Here's exactly how compatibility, loudness, and runtime work on this platform so you know what to expect before you buy.
Will It Fit My Craftsman V20 Packs? (Short Answer: Yes, All of Them)
V20 is the cordless platform Craftsman has built since its relaunch, and it now spans more than 100 tools — drills, saws, blowers, trimmers, vacuums — all running on one battery family. The packs you'll actually find on the shelf come in a handful of capacities: the compact 2.0 Ah (model CMCB202), the mid-size 4.0 Ah (CMCB204), and the 6.0 Ah (CMCB206), which carries a 3-year limited warranty.
The important part: every V20 battery rides on the same slide-on foot with identical rails and terminals, and Craftsman states the packs are interchangeable across the entire V20 tool and charger lineup. A train horn for Craftsman® V20 batteries is built around that same foot — so the 2.0 Ah pack from your drill kit and the 6.0 Ah pack from your string trimmer both slide straight on. No adapter, no modification. The only difference between them on a horn is how many blasts you get per charge, which we'll put numbers on below.
What the “V20” Name Actually Means (and Why the Asterisk)
Craftsman writes the platform name as “V20*” — and the asterisk is doing real work. The fine print says 20 volts is the maximum initial voltage, measured fresh off the charger with no load. The moment the pack starts working, it settles to its nominal 18 volts. Inside, a V20 pack is rows of lithium-ion cells at 3.6 volts nominal each — five in series gets you 18V working voltage, and 20V only at that just-charged peak.
This is the same labeling math DeWalt® uses for 20V MAX™ (also 18V nominal), while Milwaukee® and Makita® simply print the nominal number on their 18V lines. Practically, it means a V20-compatible train horn runs its compressor at the same 18 volts as the horns built for every major 18V and 20V-badged platform — so it gives up nothing in loudness. Same working voltage, same air pressure, same decibels.
One Warning: V20 Is Not the Old Craftsman Battery
Here's where V20 buyers get burned. Craftsman has had several battery systems over the decades, and they don't mix. Stanley Black & Decker bought the Craftsman brand from Sears in 2017 in a deal worth roughly $900 million, then relaunched it in September 2018 with over 1,200 new products sold through Lowe's, Ace Hardware, and other retailers. The V20 platform introduced in that relaunch replaced the old Sears-era 19.2V C3 system entirely.
So if your batteries are the older 19.2V C3 style — the chunky packs from the Sears years — they will not fit a V20 tool or a V20-compatible horn. Aftermarket adapters exist, but they mostly run in the other direction (putting a new V20 pack on an old C3 tool). And despite sharing a parent company, V20 packs are also not interchangeable with BLACK+DECKER® 20V MAX or Porter-Cable® 20V batteries — the rails and keying are different, so they physically won't seat without an aftermarket adapter. Check the label on your battery before ordering: if it says “V20,” you're in the right place. If your packs are actually a different brand, we build the same horns for those feet too.
How Loud: the 130 dB Dual and the 140 dB Quad
Two tiers are built for the V20 foot. The Dual Train Horn for Craftsman® 20v Battery runs two trumpets at 130 dB — the compact option that's easy to hand-carry on a boat or ATV. The Quad Train Horn for Craftsman® 20v Battery steps up to four trumpets and 140 dB, which is the full train-horn chord and the tier most truck owners pick.
For scale: 140 dB is the ceiling OSHA sets for impulse noise exposure — the level where a single unprotected blast at close range can hurt your hearing. That's not a warning to skip the Quad; it's a reminder that these are real train-horn levels, so point the trumpets away from people and don't fire it next to your own ear.
If you're chasing our loudest 150 dB+ tier, the Extreme Series is currently built for other battery feet — the flagship is the Extreme Series Train Horn for Milwaukee® 18v Battery, with versions for DeWalt®, Ryobi®, and several other platforms. If you're weighing whether to build your horn setup around a second battery system, our breakdown of Milwaukee M18 vs DeWalt 20V for a battery train horn covers how the two biggest platforms stack up. For V20 owners staying put, the 140 dB Quad is the top of the line today — and 140 dB is already several times the acoustic energy of a stock car horn.
Runtime: Blasts Per Charge by Pack Size
A train horn's compressor is a light load compared to a circular saw, so even the small 2.0 Ah pack delivers a surprising number of blasts. Published figures for this class of battery horn put a 2 Ah pack at 500+ short honks, or roughly 200 sustained two-second blasts, per charge. Capacity scales runtime almost linearly at the same voltage, so the V20 lineup maps out like this:
| V20 pack | ~Two-second blasts | ~Short honks | Best for |
|---|---|---|---|
| 2.0 Ah (CMCB202) | ~200 | 500+ | Handheld use — lightest carry |
| 4.0 Ah (CMCB204) | ~400 | 1,000+ | The all-around pick |
| 6.0 Ah (CMCB206) | ~600 | 1,500+ | Mounted horns, all-day events |
Treat these as order-of-magnitude estimates — blast length is the variable that dominates. Lean on the remote for five-second locomotive pulls and you'll drain a pack several times faster than someone firing quick warning honks. One thing that never changes with pack size is loudness: a 6.0 Ah pack pushes the same 18 volts as a 2.0 Ah pack, so the horn plays the same 140 dB either way. The full mechanics of that — why amp-hours buy blasts but never decibels — are in our battery Ah vs loudness and runtime guide.
FAQ
Will my old Craftsman 19.2V C3 batteries work?
No. The 19.2V C3 system is the discontinued Sears-era platform, and its packs use a completely different mount. V20-compatible horns take V20 slide packs only. If C3 packs are all you own, the horn's kit option with a battery included is the cleaner fix — adapters for this direction are not a standard item.
Do BLACK+DECKER or Porter-Cable 20V batteries fit a V20-compatible horn?
Not directly. Even though all three brands live under Stanley Black & Decker, the packs use different rails and keying and won't seat on a V20 foot. We build separate horn versions for the BLACK+DECKER® and Porter-Cable® feet, so buy the horn that matches the batteries you own instead of fighting with adapters.
Does a bigger battery make the horn louder?
No. Every V20 pack delivers the same 18 volts nominal, and voltage — not capacity — sets how hard the compressor pushes air. A 6.0 Ah pack simply buys you roughly three times the blasts of a 2.0 Ah pack at identical loudness.
Is there a 150 dB option for V20 owners?
Not yet — the 140 dB Quad is the loudest tier currently built for the V20 foot. The 150 dB+ Extreme Series runs on Milwaukee®, DeWalt®, Ryobi®, and several other battery systems, so it's an option if you already own packs on a second platform.
What remote comes with it, and how far does it reach?
The standard wireless remote is rated to about 300 feet line-of-sight — plenty for firing a bed-mounted horn from the cab or the house porch. If you want to trigger the horn from across a large property, the Long-Range Remote extends that to up to 2,000 feet.