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Surron Bikes & Parts
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Sur Ron Battery 81.4v 4026Wh 50Ah THOR V2 45Kw + Charger Full Screen
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Spare Parts

Sur Ron Battery 81.4v 4026Wh 50Ah THOR V2 45Kw + Charger

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SKU: SR-SUR-RON-BA-6259
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Brand: Surron
$2076.36
$2408.71
SAVE 13%

EBMX, VTB, Torp & Nucular Controller Compatible

In Stock
Performance Highlights
Motor Output: 45Kw
Battery Spec: 81.4V 76Ah Premium Lithium

Product Overview

Sur Ron Battery 81.4v 4026Wh
THOR V2
45Kw
EBMX, VTB, Torp & Nucular Controller Compatible
The
Thor
81.4v
use the
Hammer
to hit the Power
High Power Long Range 4026Wh
21700 Cylindrical Cells
Tough Protective 316 Stainless Steel Case
Fully Protected 220A/550A BMS
Parallel Discharge QS8 Connectors
Free High Power Loom
Power: Ultimate (45Kw)
Range: Very High (4026Kwh 268% Over OEM)
Height: Very Tall (407mm – will need seat lift kit)
Battery Activation Required On Delivery
On delivery, please contact Electron Cycles for activation of your battery.
This will also be regarded as confirmation that your battery has been received.
Sur Ron Battery 81.4v 4026Wh
THOR V2
45Kw, more volts, more RPM, more top speed. Less Field Weakening required. Less heat.  More gearing to play with!
Sur Ron Battery 81.4v 4026Wh
THOR V2
45Kw. Very similar range and power as the much more expensive Diablo, but taller and heavier. A more cost effective alternative if a touch of height and weight do not really matter.
We wanted to make a slightly more cost effective battery with almost identical performance with only a small sacrifice to range, but a huge price drop of around £300 to he Tor V1 GBP. This Sur Ron battery is only surpassed by our Molicel P50b batteries The Diablo and Zeus and it is a truly incredible piece of engineering. The build list is like a dream with top secret 21700 60A continiouse individual cell ratings, that actually out perform the highly renowned Molicel P45b. We have been secretly testing these cells for the last 6 months and  are truly confident in their exceptional abilty. We undertsand we are being a little coy in naming our cells, as we simply do not want to be be copied and plagerised again by our competitirs who do not put the time and effort in testing as we do. We have howver recoginsd this may put some customers off, so have increased the cell warranty from 12 months too 18 months. (cells only). Cells are connected by pure copper sheet connections. The Hybrid BMS is an ANT 550 BMS (220A/550A).  The exoskeleton case is made from marine grade stainless steel 316.
Cells
Cells (there are 224 in this battery) all have internal resistance. The more resistance, the more heat they produce, until they start to damage. Our new 21700 cell has a super low (lower then Molicell p45b that it is replacing) internal restistance. The cell is cheaper than the P45b and hence we are trying to bring these savings to you without reducing performance.
Power
Sur Ron Battery 81.4v 4026Wh
THOR V2
45Kw power as limited by the 550A (peak/burst) by the Ant 550 BMS. A genuine constant power of 17.9Kw (220A non stop).
Exoskeleton / Casing
We have upgraded the casing to marine grade 316 stainless steel, so absolutely no rust issues here! Super tough and powder coated inside and out.
Connector
The main Sur Ron Battery to controller connectors we use are two QS8 connectors with 6 AWG going direct into the controller and a second smaller 8 AWG QS8 connector with a free high power loom that goes via the red trip.  We use two sets to share “parallel” the power. This reduces heat, transfers load more efficiently and keeps the connectors from overheating.
Domestic Electrics
This means all your bike accessories are still powered. Some believe that not using the circuit breaker direct to the controller removes the safety of the circuit breaker. However, all our batteries have a full working BMS. Any power shorts or irregular current and the BMS shuts down.  This is much more sensitive and accurate than a mechanical breaker (you may note that the Sur Ron Ultra Bee does not use a circuit breaker and relies on the BMS alone).
Fitting
The battery uses two sets of discharge cables. One to fit the original bikes connector (for Talaria we supply an adapter so it can also fit a Sur Ron too). The second goes to an additional cable that we provide that is fixed direct to the controller. This enables the power to be fed “In Parallel” increasing the electrical flow, reducing resistance and reducing harmful heat. It shares the power delivery and takes the strain away from the original loom. These must be connected in a correct order (simple instructions supplied).
For those using a Torp Controller, Torp do not like direct power to the controller via your second cable.  You can either not use the additional power cable we supply (we do not like to remove these as often buyers transfer batteries to another bike) or, if you are worried about your Torp warranty, you can request one of our 2 into 1 convertors in the checkout notes.  Details of the adapter can be found here:
https://electroncycles.com/product/two-into-one-converter-qs8-supra-d6-talaria-oem-any-combination-available/
Specifications Sur Ron Battery
Weight 19.20KG
Cells 21700 (242).
BMS set at 550 Amps Peak.  Full battery protection including over discharge (shorts) over heating etc.
Each cell with additional individual wrapping for added protection.
Additional layers of fibre board, Kapton tape, heat shrink.
Stainless steel 316 grade sealed casing/exoskeleton with internal/external powder coated to give maximum protection and insulation.
Pure copper sheet connections.
Bluetooth BMS giving individual series condition with balanced charging (we do not recommend altering our settings as this may invalidate your warranty).
An integrated cord handle for lowering the battery in and out.
Charging port via an XT60 connector.
Battery lid hinge extenders for Sur Ron.
Height 407mm
will need seat lifter (https://electroncycles.com/product/sur-ron-seat-lift-kit-aluminium-black/)
Cell Specifications
Typical capacity: 4500mAh
Rated Voltage 3.6 V
Max Discharge current 30A max.
Max Discharge current: 60A with 80C temperature cut off.
Chemistry: Li-ion
Cycle life (100% DOD 25°C): 600 cycles>60% (RT 8A / 30 a)
Operating temperature range( cell surface): charge: 0~55℃
Discharge: -20 ~ 80℃
Diameter: 21.30±0.15 mm
Height: 70.50±0.25 mm
Weight: 69g
Connecting To Bike
When connecting the battery to the bike and to avoid a spark, turn the red trip switch on the bike to off. Connect the older original power cable and then turn the red trip to on. Then connect the new power leads. Removing the battery has no special order.
Battery Charging
First time charging is VERY important. Always connect the charger to the battery with the charger powered up at the mains first. This will stop a “Connection Spark”. The battery needs a “Balance Charge” on first charge. Please charge for 12 hours first time.  Always charge your battery in a safe place and never unsupervised.
Charger Not Included
Our recommended charger for this battery is:
https://electroncycles.com/product/charger-81v-92-4v-6a/
This Battery will not work with an original standard Sur Ron Controller
Bike Not Included

Technical Specifications

BrandSurron
SKU IdentifierSR-SUR-RON-BA-6259
Motor Architecture45Kw
Battery Pack81.4V 76Ah Premium Lithium
Warranty Term2 Years Limited Warranty

5.0

Based on 1 verified rider reviews

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Customer Reviews

Alex
Verified Owner
Oct 02, 2026
Smooth throttle modulation and range

Battery holds charge exceptionally well even in sub-zero morning temperatures. Highly recommend this store.

Surron Freight & Warranty Guarantee

Shipping Policies

E-bikes ship with specialized heavy freight ground carriers in custom reinforced double-walled protective cartons. Delivery typically completes in 3–5 business days. Free shipping applies automatically to all orders over $500.

2-Year Limited Warranty

Surron electric bikes carry an extensive 2-year warranty covering frame integrity, motor internals, and electronic controllers against manufacturing defects. Battery packs are guaranteed to retain at least 70% capacity through 500 charge cycles.

Component Synergies

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