EBMX 72V 42Ah Battery for SurRon LBX

Fitting a 72V Surron battery to a Light Bee X is the biggest single change you can make to how the bike rides, and the EBMX 72V 42Ah pack makes it clean: it sits in the stock battery slot as a plug and play solution once the supporting parts are in place. Those supporting parts are the point of this guide. A 72V pack is a system upgrade, not a battery swap, and that matters for your controller, your charger, your seat and where you can ride afterwards.

A 72V Surron battery is a system change, not a swap

The stock Light Bee X runs a 60V system. Its controller, its charger and its display all expect a 16 series pack that sits at 67.2 volts when full. The EBMX 72V Surron battery is a 20 series pack that sits at 84 volts when full. That extra 17 volts is exactly where the performance comes from, and it is also why the stock 60V controller cannot be used with this pack. EBMX is explicit: the battery requires an EBMX controller upgrade and will not run on the stock 60V controller.

The same logic applies to charging. A 60V charger stops at 67.2 volts, which on a 72V Surron battery is barely three quarters full, and it is not designed to talk to this pack at all. A 72V charger is required, and the stock charger goes in a drawer or stays with the original pack if you keep it.

Why riders accept the extra cost

Voltage is the lever that raises motor speed and, with the right controller, peak power. Move to 72V and the same motor spins faster and makes more at the top end, which is why serious Light Bee builders choose a 72V Surron battery rather than simply buying a larger 60V pack.

The pack by the numbers

The nominal figures are 72 volts and 42 amp hours, which multiply to 3024 watt hours of stored energy. The standard Surron Light Bee battery is a 60V 32Ah unit holding 1920 Wh, so the EBMX 72V Surron battery carries about 57 percent more energy in a case that is only slightly larger than the original. That is the combination that makes it attractive: more range and more voltage from the same slot.

Two things the table does not show. First, the pack’s BMS and internal construction are specified for the high discharge a large controller demands, not the modest draw of a stock bike. Second, the extra energy adds mass. EBMX does not publish a weight in our listing, so we will not guess at one, but a 72V Surron battery holding 57 percent more energy than the original will be a heavier lift to the charger.

What you need alongside the pack

A 72V Surron battery on its own does nothing. Budget and plan for the whole system before ordering, because the pack, the controller and the charger arrive as three separate decisions and the bike will not run until all three are in place.

1. An EBMX controller. The EBMX X9000 power kit is the controller we pair with this pack. It is engineered as a direct bolt in replacement for the Light Bee, the Ultra Bee and the Talaria Sting, and it is the part that turns 84 volts into usable power.
2. A 72V charger. The stock charger cannot be used. You need a lithium charger with an 84 volt cut off and a current the pack’s BMS is rated to accept. Ask us to match one to the pack when you order.
3. A fitment check. If the bike wears an aftermarket seat, the slightly larger case of the 72V Surron battery may foul it. Send us details of the seat before you commit.
4. A place to ride. A converted Light Bee is an off road machine. Sort out private land with permission or a club venue before the bike is finished, not after.

Our controller upgrade guide walks through the EBMX, Nucular and other controller options if you want to understand why the X9000 is the natural partner for a 72V Surron battery conversion.

Fitting it into the Light Bee X frame

The 72V Surron battery occupies the same space as the original Sur Ron pack, as does the 60V EBMX version, so no frame work is needed. The case is slightly larger than the factory unit, which is how EBMX reaches 42Ah at 72V inside the slot, and on a standard bike that extra size is absorbed without issue. Where it can bite is aftermarket seats: many are moulded around the smaller stock pack, and a fuller case can lift the seat base or stop it latching.

The 72V Surron battery connects through the bike’s own connector and is intended as a plug and play fit once the controller is installed. Installation order matters: fit the controller and its wiring first, confirm the loom is tidy and clear of the battery cavity, then seat the pack and connect it. A pack forced past a stray cable is the most common way a fresh conversion damages itself on day one.

Checks before the first ride

• The 72V Surron battery latched and unable to move in the slot when you rock the bike.
• Seat closed fully and latched; a seat riding on the pack will wear the case.
• Controller configured for a 20 series pack, with the low voltage cut off set for 72V rather than 60V.
• Display reading a sensible voltage; if it shows an error or a wildly wrong percentage, stop and check the controller settings before riding.

Compatibility table: Sur Ron and Talaria models

We are a Talaria specialist, and Talaria owners regularly ask whether this 72V Surron battery suits their bike. It does not: the Sting battery cradle, connector and slot dimensions differ from the Light Bee, and Talaria owners looking for more capacity should look at the 60V 65Ah EBMX battery for the Sting instead. The table below sets out where this particular pack belongs.

If you are still deciding between the two brands rather than upgrading a bike you own, our Talaria versus Sur Ron comparison covers stock battery capacity, weight and upgrade paths side by side.

Charging and balancing a 72V pack

A 72V Surron battery must be charged by a charger built for 20 series lithium packs with an 84 volt cut off. Never connect the stock 60V Sur Ron charger, and never connect a 72V charger to a 60V pack: each pairing is either useless or dangerous. Label the chargers if both packs live in the same garage.

Charge time for a 72V Surron battery depends on the charger’s current rating, which is why we match the charger to the pack at order rather than quoting a single figure here. As a guide, divide 42 amp hours by the charger’s amp rating for the bulk phase, then add time for the constant voltage stage in which the BMS brings all twenty cell groups level. Let that stage finish: a 20 series pack that is repeatedly unplugged early will drift out of balance and lose usable capacity.

Good habits for a high voltage pack

• Cool the pack after a ride before charging. High power builds heat the cells more than a stock bike does.
• Connect the pack first, then switch on at the mains. Reverse the order to disconnect.
• Charge in a dry, ventilated space on a non flammable surface and stay on the premises.
• Do a full balancing charge at least every few rides, even if you normally stop short of full.
• For storage longer than a week, hold the 72V Surron battery at 40 to 60 percent rather than full.

Off road only: the legal position after conversion

A Light Bee X is an off road bike in the UK, and it stays that way with a 72V Surron battery fitted: private land with the landowner’s permission, or a permitted club venue. It cannot be ridden on public roads, byways, bridleways, footpaths or pavements, and green lanes count as public roads, as the Trail Riders Fellowship explains for owners of road registered machines.

The road legal Light Bee L is a different case, and a 72V Surron battery changes it. Its approval under Regulation 168/2013 is for the bike as homologated, with its 60V system and its power limits. Replacing the battery with a 72V pack and the controller with a high powered unit changes the vehicle, and a changed vehicle is no longer the one that was approved. Treat a converted Light Bee L as off road only. If you want a bike you can register, insure and ride on the road at higher power, the answer is an L3e machine built that way from the factory, not a conversion.

Storage, carriage and end of life

Store the 72V Surron battery indoors in a cool, dry room, out of direct sun and away from anything that could fall on it, at a partial state of charge if it will sit for more than a week or two. Check the voltage monthly and top up if it has drifted low. A pack that has been dropped, has a cracked case, smells of solvent or is warm at rest should be isolated on a non flammable surface and reported to us. The pack is covered by our UK warranty, full terms on the warranty page.

At 3 kWh a 72V Surron battery is dangerous goods for carriage. It ships to you in compliant packaging and cannot simply be posted back; if a return is ever needed, contact us and we will arrange a compliant collection. UK mainland delivery, timescales confirmed at checkout. In your own vehicle, strap it so it cannot slide, keep it out of a hot cab, and never transport a pack you suspect is damaged.

Disposal

A worn out surron lbx battery of this type must never go in household waste. The GOV.UK batteries and accumulators guidance sets out the UK rules and compliant take back routes, and most local authority recycling centres operate a separate lithium battery point. We can also advise on returning a spent 72V Surron battery for recycling. Do not open the case: there is nothing user serviceable inside and a disturbed 20 series pack is a serious fire risk.

Frequently asked questions

Will this pack run on my stock Light Bee X controller?

No. The stock controller is a 60V unit and this is a 20 series 72V pack that reaches 84 volts when full. EBMX state that the 72V Surron battery requires an EBMX controller upgrade and will not run on the stock 60V controller. Plan the pack and the controller as one purchase, with the EBMX X9000 kit as the natural partner.

Can I keep using the charger that came with the bike?

No. The stock 60V charger stops at 67.2 volts and is not designed for this pack. You need a 72V lithium charger with an 84 volt cut off and a current rating the pack’s BMS accepts. Never use a 72V charger on a 60V pack or a 60V charger on this pack. We will match a charger to the pack when you order.

Does it fit the standard battery slot?

Yes. The 72V Surron battery and its 60V EBMX sibling both use the space of the original Sur Ron pack, though the case is slightly larger than the factory unit. That can cause fitment issues with aftermarket seats shaped around the smaller stock pack. If you run an aftermarket seat, contact us with the details before ordering.

How much more range will I get?

The EBMX pack stores 3024 Wh against 1920 Wh for the standard 60V 32Ah pack, about 57 percent more energy. How that converts into distance depends on the controller tune, your weight, the terrain and how often you use full throttle. A high powered build will use the extra energy quickly if you ride it hard; ridden like a stock bike, the range gain is substantial.

Is a 72V converted Light Bee legal on the road?

No. A Light Bee X is off road only regardless of battery. A road legal Light Bee L converted to 72V with a high powered controller is no longer the vehicle that was type approved, so it should be treated as off road only too. Ride on private land with permission or at club venues, never on roads, byways, bridleways or footpaths.

Does the 72V Surron battery fit a Talaria?

No. The Talaria Sting uses a different cradle, connector and slot, and this pack is dimensioned for the Light Bee. Talaria Sting owners wanting more capacity should look at the 60V 65Ah EBMX pack, which fits the Sting compartment and runs on the stock controller. The MX5 Pro is already a 72V bike with its own pack.

Next steps

Order the 72V Surron battery together with the EBMX X9000 power kit and a matched 72V charger, and contact us first if your Light Bee wears an aftermarket seat so we can confirm fitment. Every pack and charger we stock, for Sur Ron and Talaria alike, is listed in the batteries and chargers category.

Buying this from The Talaria UK

Our service promise as a UK Talaria specialist.

• Checked before it shipsEvery bike is unboxed, inspected, torqued, charged and test run in our workshop before the courier is booked. You get a machine that is ready to ride, not a crate and a leaflet.
• Packed to arrive intactBikes travel in their factory crate with the fragile parts protected, and we tell you exactly what to check before you sign for it.
• UK mainland deliveryShipped across the UK mainland, with options, costs and timescales confirmed at checkout and tracking sent on dispatch.
• Answers from people who ride theseAsk which model suits your weight, your ground or your licence and you get an answer from someone who has set these bikes up, not a script.
• Parts on the shelfWe stock the batteries, chargers, controllers, motors, forks and wheels for what we sell, so a repair or an upgrade is a stock check rather than a long wait.
• Covered after you buyEvery bike is covered by our UK warranty, with the period for this model shown on this page and in your order confirmation, and claims handled by the team that inspected it.

Questions before you order? Contact us, or read the delivery guide, the warranty terms and finance options.