Peak amps sell the box; the clamps decide whether it works · review
The clamp cable on its own, with an LCD that reads battery voltage even with no pack attached.
The last word Not a jump starter — the clamps. Which is what this shelf says decides whether a jump starter works, sold as the spare part it is.
A replacement clamp cable: one cable assembly with red and black battery clamps, a smart LCD control module and a jump starter connector, for MEGAWISE G23, G15P and G50 packs “as well as other compatible 12 V portable jump starters”. 240 g (8.5 oz), 356 × 64 × 30 mm (14 × 2.52 × 1.18 in). $15.08.
“Jump starter is not included and is required for vehicle jump-starting.”
The line at the top of this shelf is: “Peak amps sell the box; the clamps decide whether it works.”
And the introduction: “Then come the parts you actually hold: clamps with real copper, reverse-polarity and spark protection, and honest behavior in the cold.”
This product is that half of the shelf sold on its own. Every other item here is a pack with clamps attached; this is the clamps, with the electronics that make them safe, and no pack.
So there are two reasons to buy it and one reason not to.
Buy it if a MEGAWISE pack’s cable is lost or damaged — which is the common way these packs die, since the cable lives loose in a boot and the pack does not. At $15.08 against $169.00 for the DEWALT unit on this shelf, replacing the cable rather than the pack is the whole argument.
Buy it if you want a cheap voltage reading on a battery, for the reason below.
Do not buy it expecting to start a car. It cannot. The listing says so in its last sentence.
“When the clamps are connected directly to a vehicle battery without the jump starter attached, the display can show the battery voltage.”
That is an unusual and genuinely useful sentence, because it makes a $15.08 spare part into a crude battery check.
A 12 V battery at rest should read about 12.6 V fully charged and about 12.0 V at a quarter charge; below about 12.4 V it is worth charging before blaming anything else. A reading is not a test — this site’s battery testers shelf covers the load and conductance testing that tells you whether a battery will crank — but a voltage is the first thing anyone measures, and this displays one.
Of the seven items on this shelf, three publish a screen: the published BUTURE at 3.3 inches, the published BRPOM at 2.5 inches, and this LCD module, at a size not stated.
“The smart control module includes reverse-polarity, short-circuit, reverse-charge, high-temperature and overload protection to help detect abnormal operating conditions when used as directed with a compatible jump starter.”
And: “LCD indicators and audible alerts help identify conditions such as incorrect clamp connections, abnormal voltage or excessive temperature.”
Naming them is the point. The published AstroAI pack states “10 built-in safety functions” as a count without a list; the DEWALT unit here states reverse polarity alone. This states five by name and says which produce an audible alert.
That matters because of the procedure this site publishes for the shelf: “Red clamp on the positive, black clamp on a metal earth point of the vehicle away from the battery, never on the negative terminal. That is the precaution against a spark near battery gases.” An audible alert for a wrong connection is a guard on the step where the mistake is made.
The qualifier “when used as directed with a compatible jump starter” is also published, and it is doing work: the protections are in the module, and the module is between a pack and a battery.
“Designed for MEGAWISE G23, G15P and G50 jump starters, as well as other compatible 12 V portable jump starters. Please verify connector type and compatibility with your specific unit before ordering, as connector appearance alone does not confirm compatibility.”
That last clause is rare and it is honest. These cables use a handful of physical connector shapes shared across dozens of brands, and a plug that fits is not a plug that is wired the same way — the pin assignment and the handshake the pack expects can differ behind an identical shell.
So: three model numbers are confirmed, and anything else is for the buyer to establish. A cable that fits the socket and talks the wrong protocol is at best inert.
Against 329 g (11.6 oz) for the published AstroAI pack — the lightest complete pack here — and 7,847 g (276.8 oz) for the DEWALT unit.
356 mm long is the cable; 64 × 30 mm is the module and the clamps folded. It is a part, and it coils into a glovebox.
No cable gauge and no copper claim, which is precisely what this shelf asks for: “clamps with real copper”. No current rating, so what the cable will carry is unknown. No cable length separate from the packed dimension. No LCD size. No list of the “other compatible” packs, by design. No operating temperature, on a part used at a roadside in winter. No warranty.
At $15.08 it is the right purchase for a lost MEGAWISE cable and a voltage reading, and it will not start anything by itself.
On sale at around $15 on the American Amazon store at the time of checking.
Prices and availability are what Keepa reported on the date this page was updated; both move.
Prices quoted in this text were read on 6 October 2026. The live price is at the top of the page.
| What it is | A replacement clamp cable — the jump starter is not included |
|---|---|
| Confirmed for | MEGAWISE G23, G15P and G50 |
| Other packs | Compatibility must be verified; connector shape alone does not confirm it |
| Display | LCD on the control module; reads battery voltage with no pack attached |
| Protections | Reverse polarity, short circuit, reverse charge, high temperature, overload |
| Alerts | LCD indicators and audible alerts |
| Supplied | One cable assembly, red and black clamps, module, pack connector |
| Weight | 240 g (8.5 oz) — the lightest item on this shelf |
| Packed size | 356 × 64 × 30 mm (14 × 2.52 × 1.18 in) |
| Cable gauge or copper claim | NOT PUBLISHED |
| Current rating | NOT PUBLISHED |
| Operating temperature | NOT PUBLISHED |
| Amazon reference | B0D7Q1WP5F |
| EAN | 0734257170079 |
No. It is the clamp cable, and MEGAWISE says it in the last line of the listing: "jump starter is not included and is required for vehicle jump-starting." It is on this shelf because the shelf’s own line is "peak amps sell the box; the clamps decide whether it works" — this is that half, sold as a spare part.
Only if you check first, and MEGAWISE says so unusually plainly: "verify connector type and compatibility with your specific unit before ordering, as connector appearance alone does not confirm compatibility." A handful of connector shells are shared across dozens of brands, and a plug that fits can still be wired differently or expect a different handshake. Confirmed: G23, G15P, G50.
No, but it is the first useful reading. A 12 V battery at rest reads about 12.6 V full and about 12.0 V at a quarter charge, and under roughly 12.4 V it is worth charging before blaming anything else. A real test measures what the battery does under load — this site’s battery testers shelf is where that comes from. What is unusual here is that these clamps show a voltage with no pack attached at all.
Details checked on October 6, 2026.
A MEGAWISE pack whose cable has gone missing, and a quick voltage check
Amazon reports what buyers took in the month before this page was last checked: at least 50.
The figure is a floor, rounded by Amazon, and read through Keepa — it says what buyers picked, not what a maker claims.
Specifications: the manufacturer sheet for garage tools and the matching Amazon product page. Prices and availability: Keepa. Every figure on this page names its source.
329 g (11.6 oz) stated · −20 °C (-4 °F) to 50 °C (122 °F) stated · 10 built-in protections · QC 3.0 USB output
The pocket one: 329 grams, ten stated protections and a working range from −20 to 50 °C (-4 to 122 °F) — bought for the winter morning rather than for a headline current figure.
Best for: A small petrol car, and anyone who would rather carry the pack than store it.
9000 A peak stated · 160 PSI inflator with memory and preset · 2.5-inch LCD · 3 LED modes
The same idea as the pack above with a higher stated inflator pressure and a memory function that remembers the last pressure you set.
Best for: A household with a van, a trailer or a caravan, where tire pressures are higher.
≈ $70
5000 A peak stated · 150 PSI inflator with preset and auto-stop · 3.3-inch display · 9 functions stated
Two tools in one case: a jump starter and a 150 PSI inflator with a preset and automatic stop, on a 3.3-inch screen.
Best for: A car that goes on long trips, where a flat tire and a flat battery are the two things you cannot solve on foot.
