In development · Notify list open · No preorders, no payment · J1772 adapter $65
Communicating chargers · USA-designed protocol

EMG Chargers for SURRON

5 A, 12 A and 15 A chargers for the SURRON Ultra Bee and Light Bee V2 that actually talk to the battery. The communication protocol and PCB are designed in the USA, by hand, by an independent builder — not sourced from a grey-market listing and hoped for the best.

Notify me when in stock Find my charge port J1772 adapter · $65

No preorder. No payment. Leave an email and pick a model — you get one message when that model is in stock.

Talks to the BMSHandshakes with the SURRON battery instead of just pushing volts at it
Designed in the USACommunication protocol and PCB designed by Kevin Graehl
Fits under the seatSized to ride with you, not to live on a bench
5 A / 12 A / 15 APick overnight-gentle or get-back-out-fast

The fix for a grey-market charger problem

SURRON chargers are built in China, and getting a correct one in the United States usually means an unmarked listing, no documentation, no support, and no idea who to call when it stops working. Substituting a generic power supply is worse — the battery's BMS expects a conversation, not just a voltage.

These chargers hold that conversation. They are, as far as I know, the only chargers that actually communicate with the SURRON battery whose communication protocol and PCB are designed in the USA — by me, Kevin Graehl, in the San Francisco Bay Area. Buying one supports a small local business instead of a reseller chain, at a price meant to stay reasonable.

Protocol designed in the USA. The BMS communication is reverse-engineered, documented and implemented here — the same protocol work behind the Surron Battery Reviver.
PCB designed in the USA. Schematic and board layout done in-house, not a relabeled OEM board.
A real person to ask. One builder, reachable by email, who has the protocol notes and the test bench.
Reasonable pricing. Priced to be worth buying instead of gambling on a marketplace listing. Final pricing is announced at launch.

Which charge port do you have?

Every charger model comes in two variants, and the only thing you need to check is the connector on the bike. Lift the seat, look at the charge port, and count the pins.

Tap either photo to enlarge it.

Variant A

4-pin charge input

Four pins in the charge port. This is the long-running SURRON charge connector used across most Ultra Bee bikes before the 2026 model year. If you count four holes, you want the 4-pin variant.

Variant B

6-pin charge input

Six pins — two large pins and four small ones. The big pair carries charge current; the four small pins carry the communication and control signals. This is what you'll find on the 2026 bikes and on the Light Bee V2. If you count six holes in two sizes, you want the 6-pin variant.

Not sure which one you have? Send a photo of your charge port to hello@electricmotogarage.com and I'll tell you.

The lineup

Three current ratings per platform. The 5 A is the quiet overnight charger; the 12 A is the everyday one; the 15 A is for turning a lunch stop back into ride time. All of them fit under the seat and all of them communicate with the pack.

Charge speed is ultimately limited by what the battery's own BMS will accept. Raising that ceiling is active research here, and no charger can exceed it safely without the pack agreeing.

SURRON Ultra Bee

EMG Charger
Ultra Bee

A communicating charger for the 20-series SURRON Ultra Bee pack. Available in both the 4-pin and the 6-pin charge-port variant, so it matches whichever connector your bike shipped with — including the 2026 six-pin port.

5 AOvernight

Gentlest on the cells. Plug in when you get home, full by morning.

12 AEveryday

The balance point — meaningfully faster without asking much of the pack.

15 AFast

Maximum usable rate, subject to what the pack's BMS allows.

PlatformSURRON Ultra Bee
Pack configuration20 series
OutputRegulated to the pack's charge setpoint, negotiated over the BMS link
Charge connector4-pin or 6-pin (2026) — choose your variant
Current options5 A · 12 A · 15 A
MountingFits under the seat
AvailabilityIn development — join the notify list
Two variants of this model. Pick 4-pin if your charge port has four pins, or 6-pin if it has two large pins plus four small ones. See Which charge port do you have?
SURRON Light Bee V2

EMG Charger
Light Bee V2

Same six-pin connector as the 2026 bikes, but a different animal underneath: this is a 22-series pack running a higher voltage, so it needs a charger built for that ceiling. Do not substitute an Ultra Bee charger here.

5 AOvernight

Low and slow at 94.16 V — the easiest charge on a high-series pack.

12 AEveryday

The default choice for a bike that gets ridden and charged daily.

15 AFast

Top rate, again capped by the BMS's own current limit.

PlatformSURRON Light Bee V2
Pack configuration22 series
Output voltage94.16 V
Charge connector6-pin (two large pins, four small)
Current options5 A · 12 A · 15 A
MountingFits under the seat
AvailabilityIn development — join the notify list
Higher voltage than the Ultra Bee charger. The 22-series pack charges to 94.16 V. The connector looks identical to the 2026 Ultra Bee six-pin port, so order by bike, not by connector, for this one.
InMotion P6

EMG Charger
InMotion P6

A configuration of the EMG charger for the InMotion P6 — adjustable output and high-voltage capable, so you can choose a lower charge ceiling for longevity or take the wheel to full before a long day.

PlatformInMotion P6
OutputAdjustable, high-voltage capable
Why adjustableSet a lower charge ceiling for daily riding and cell longevity; take it to full only when you need the range
MountingCompact enough to travel with the wheel
AvailabilityIn development — join the notify list
Specifications still being finalized. Exact voltage range, current options and connector for the P6 version will be published before launch. Join the list and you'll get those details with the stock notice.

Small enough to ride with you

Every one of these chargers is built to fit under the seat. That's the whole design constraint: a charger that lives on a workbench only helps you at home, and a charger you can carry turns every outlet you pass into range.

Some models will also accept 100–240 V AC input, which means the same charger works at your house, in an RV, at a friend's garage, at a campsite pedestal, or overseas — and, with the adapter below, at a public EV charging station.

Under-seat fit. Sized and shaped to stow on the bike rather than stay behind.
100–240 V AC input on some models. Home, RV, shop, or abroad on the same unit. Model-by-model input range is published at launch.
Charge away from home. Pair with the J1772 adapter and any public charging station becomes your outlet.
Choose your rate. Carry the 5 A for trips and keep the 15 A on the wall, or the other way around.
Available to order at launch

J1772 charging adapter

$65USD

Converts a J1772 public EV charging station into a standard AC outlet. Swipe your card at any ChargePoint, Rivian, or other J1772 station in a parking lot or downtown, plug your charger into the adapter, take up the spot, and charge as fast as your battery's internal BMS will allow.

This is the piece that makes a portable charger genuinely portable. It is the same trick I started doing years ago on the PEV side — plenty of people have copied it since, which is fine by me.

Be a good neighbor about it: don't camp on a station a car is waiting for, and follow the posted rules at the site.

Notify me when it's in stock
J1772 to AC outlet charging adapter, shown from several angles
Photo: thanks Roger — placeholder, own photos coming
Charge the right pack with the right charger

These are high-voltage lithium battery chargers. An Ultra Bee charger on a Light Bee V2 pack — or the reverse — is not a minor mismatch. Match the model to the bike and the variant to the connector, and if you are unsure, ask before you plug in.

Order by bike, then by connector. The 2026 Ultra Bee and the Light Bee V2 share a six-pin port but not a voltage.
The BMS has the final say. Charge current is capped by the pack's own limit; a 15 A charger will not force more through than the battery permits.
Don't leave a damaged pack charging unattended. Swollen, wet, crash-damaged or previously overdischarged packs need diagnosis first.
Diagnosis is a separate tool. If the pack itself is the problem, that's what the Surron Battery Reviver is for.

Notify me when it's in stock

Leave an email and pick which one you want. You'll get one message when that model is available — nothing else. No preorder is created and no payment is taken.

Electric Moto Garage will use this address only for EMG Charger availability and closely related launch updates. Unsubscribe anytime. Questions, or want a photo of your charge port identified: hello@electricmotogarage.com
Charge connector