29.4V vs 42V Hoverboard Chargers: How to Tell Which You Need
Quick answer
A 36V hoverboard needs a 42V charger. A 24V hoverboard needs a 29.4V charger. The two chargers often have the exact same round 3-prong plug, so the plug tells you nothing — read the OUTPUT voltage on your old charger or the battery label under the board, and match it exactly.
Why there are two different hoverboard voltages
Almost every self-balancing hoverboard runs on a lithium-ion battery pack made of 18650-style cells wired in series. Each lithium-ion cell has a nominal voltage of about 3.6V and is full at 4.2V. The number of cells in series decides the pack voltage.
A 10-cell pack (written 10S) is sold as a 36V battery. When full it sits at 10 × 4.2V = 42V, so its charger outputs 42V. This is by far the most common hoverboard setup and covers most full-size 6.5-inch, 8.5-inch and 10-inch boards.
A 7-cell pack (7S) is sold as a 24V or 25.2V battery. When full it sits at 7 × 4.2V = 29.4V, so its charger outputs 29.4V. You mostly find these on smaller, lighter and kids' hoverboards and some budget models.
Notice that the number on the charger is always higher than the number on the battery. That is normal: the charger is rated for the pack's full-charge voltage, while the battery is rated for its average (nominal) voltage.
Why the plugs look the same
Hoverboard makers standardized on a small round 3-prong connector (about 8–9mm across) years ago, and both 42V and 29.4V chargers are built with it. The plug was chosen for low cost and wide availability, not to prevent mix-ups. That means a 42V charger will physically plug into a 24V hoverboard and a 29.4V charger will plug into a 36V hoverboard.
Many online listings also show a generic photo of a black brick with a round plug, so you cannot rely on the picture either. The only reliable way to choose is by the voltage printed on the label.
How to tell which one you have
1. Look at your old charger. Find the line that starts with OUTPUT. It will say something like "OUTPUT: 42V ⎓ 2A" or "OUTPUT: 29.4V ⎓ 1A". That first number is the one to match.
2. If the charger is lost, flip the hoverboard over. There is usually a sticker on the underside or on the battery cover listing the battery as 36V or 24V (sometimes 25.2V), often with a capacity such as 4.4Ah.
3. Check the user manual or the manufacturer's page for your exact model. Our model pages list the charger output and plug to compare with your original charger's label.
4. If you're still not sure, a multimeter across the charging port pins of a charged board will read roughly 36–42V for a 36V pack or 24–29.4V for a 24V pack.
The fire risk of using the wrong one
A 42V charger on a 24V (29.4V full) pack pushes each cell far beyond 4.2V. Lithium-ion cells that are overcharged can heat up, swell, vent flammable gas and catch fire — this is the classic hoverboard fire scenario. The battery management board may not stop it, especially on cheap boards.
A 29.4V charger on a 36V pack is not a fire risk in the same way, but it will never charge the board properly. The pack sits at a low state of charge, the board may beep or refuse to power on, and you may assume the battery is dead when it is not.
Whatever you buy, choose a UL-listed charger (look for UL 2272 on the board and a UL mark on the charger), charge on a hard surface away from anything flammable, and unplug once the light turns green.