CYC X1 Stealth Motor 1800W ASI BAC855 Controller, BB 68-83mm (smaller frame) 52v 17.5Ah Charger

£1,499.00 (price including VAT)

CYC X1 Stealth Motor 2200W ASI BAC855 Controller, BB 68-83mm (smaller frame) 52v 17.5Ah Charger

1 in stock



CYC X1 Stealth Motor 1800W ASI BAC855 Controller, BB 68-83mm Battery (smaller frame) 52v 17.5Ah + Charger

UK Stock all taxes paid

Take a look at this video!!

Sorry NO International orders – Free UK Mainland

X1 STEALTH (BB 68-83mm version, please check you bottom bracket type is compatable)

The X1 Stealth is the all new lightweight mid drive conversion system. With up to 1800W of power output, a small form factor, and a more silent performance, this is the ideal system for ebike & emtb riders wanting a stealthy setup.

The X1 Stealth is complete with

– integrated torque sensor

– fully customizable mobile app

– various bottom bracket fitments

– 2 rider modes, with up to 9 assist gears

STOCK ITEM Torques sensing, 11/63 chain version with 38T chainwheel.


X1 STEALTH 36-72V 1800W mid drive conversion kit

Display: 750c display
Bottom bracket width: BB 68-83mm version
Chainring options: 11/63T
Crank Arm Length: 170mm
Throttle options: Thumb throttle

BAC855 controller setting: 52V

More details can be found here:

User manual can be found here:

Please note, we give a full warranty on this. The motor is in it latest version, now more reliable than ever and modified to improve the end result of the earlier versions. CYC in Hong Kong are giving an excellent warranty but sometimes there is a wait until a part is redesigned or goes to fabrication. Parts are normally shipped to us within 10 working days

Take a look here:

Help and instructions:

**** Due to the nature of this device (Off-Road) and exposure to water, rain, mud and the possibility to sustained high powered use/abuse, our warranty is limited to 12 months from time of purchase.

Warranty parts may take two weeks to replace as they are fast shipped to us from Hong Kong and are not covered for poor installation or misuse (crashes etc). We will remove new parts from motors in stock if necessary to speed up your replacement.

Items are liable to change without notice

Helpfull videos:

X1 Stealth Install video:

BB92 Press fit video:


52v 17.5Ah Smaller Cased, Semi High Power Long Range 50A/1800W Down Tube Battery + 4A Charger


More powerful than our nearest 52v 19.5Ah, this is managed by a 50A BMS and 5 parallel cells all handling 10A each 18650 cells. Cells are LG MJ1.

The LG MJ1 are extremely similar cells (we have not mixed cells, just mixed the whole batteries on the shelf) 3500Mah per cell and with 4A UK charger. 50Amp Nominal BMS. 5p x 10A cells  and designed for 2200w max motors and pure nickle welded contacts). Downtube type battery, designed to fit on down tube utilizing water bottle bolts. This battery is physically the smallest we do yet still have enough power for the BBSHD and CYC Stealth motors. These cells are volumetrically small than the 21700 yet more powerful (we can squeeze more cells in).

We do not recommend these batteries for power output above 50A (22000watts), these will handle all 50A or lower 48/52V applications but have been specifically built for the Bafang BBSHD, G510 Ultra drive and CYC Stealth. They have Anderson connectors and are “plug and play” for Bafang BBS02/BBSHD motors.

Please ALSO note, these are genuine new cells and made up into complete battery specially to order for us at the factory. These are not “off the shelf”  batteries that are found similar to by other vendors. We buy the same cases and there it stops – everything is bespoke to Electron Cycles Limited. We simply can’t buy a single battery, w have to agree to a production run of at least 30 batteries. Thanks to Paypal fees, shipping and taxes the markup is minimal! Not all down tubes are the same and some slight modification may be necessary to the mounting plate of the battery.

You Tube has an abundance of “How To” videos.

We do not connect the USB port as we have found that with our wet UK weather, can cause reliability issues.

We recommend the purchase of Alfatex velcro 30cm * 3cm (available on Ebay) for additional support.

Google “Tip for hard mounting shark pack to bicycle frame Ebike

Space required, please see photo= H 125 mm * L 368 mm * W 95 mm please allow another 25mm to get on and off cradle

Technical Data:

Battery Model 52V 17.5Ah
Nominal Capacity (AH) 17.5Ah
Nominal Voltage (V) 51.8V
Source Resistance (mΩ) 12-14
Cell Specification 3.7V 3200mAH 3C Powerful Samsung 32E or LG MH1
Cell Combination 14-series, 5-parallels
Cell Size 18650 Cylinder Cell
Diameter: 18mm, Height: 65mm length 65mm
Cell Quantity (parallel*series) 56 pcs
Discharge Cutoff Voltage (V) 43  +/- 1V
Charge Cutoff Voltage (V) 58.8V
Rated Discharge Current (A) 17.5A
Maximum Continuous Discharge Current (A) 50A (with BMS Board Limited)
Maximum Continuous Charge Current (A) 10A
Charge Mode CC/CV
Standard Charge Current (A) 2A (per cell or 8A per 4p)
Charge Time under Standard Charge Current hours
Fast Charge Current (A) 4A
Charge Time under Fast Charge Current 4 hours
Charge Temperature Range 0 – 60 ℃
Discharge Temperature Range -20 – 60 ℃
Battery Size 370*110*90mm
Charging/Discharge Cycles > 1000 cycling times
Battery Net Weight 5.2kgs
Battery Gross Weight (include charger and packing) 7.2kgs
Battery Application For less than 48V 2200W Motor

Charging: First time charging is VERY important. Always connect the charger to the battery with the charger powered up from the mains. This will stop a “Connection Spark”. The battery needs a “Balance Charge” on first charge. Please charge as above. The charger will display two red lights (charging) after a long period of time (between 1 and 8 hrs – depending on state) the LED charger lights will display red and green. This indicates an initial charge is complete. However, as this is a new battery, not all cells within the battery are balanced (same state of charge as some were higher/lower than others to start with). This is because cells can arrive at the factory in different batches and may have slightly different charges due to time in storage). This is very common and normal. Now please leave the charger connected to the batteries for a further 12 hrs. This allows the internal balancing system (BMS) to balance out all the internal cells. The charge may turn on and off over this period of time. This “Balance charge does not need to be done every time and is recommended every 20+ charges. Leaving the charger plugged in working does not damage the batteries. The charger is designed to stop charging at a preset level and turn on again when this level drops.

* 6 Month Warranty is for manufacturing defaults and does not cover missuse or accidental damage. These units are extremely strong and robust and will not let you down unless abused. We undertake warranties here in the UK. We take the pain!

Please note, Lithium batteries are considered hazardous and due care and attention should be taken. Although these cells are in wide use, and professionally manufactured in a purpose built factory; because of the power of the battery, we strongly recommend that precautions are taken. We do not recommend charging inside the family home and charging should be supervised. We take no responsibility for misuse. These batteries are thoroughly tested (full discharge and charge cycles at the manufacturing stage and also pre-delivery). These are not DIY or amateur built devices.



We reserve the right to slightly modify or change this product without notice.


Buyer releases Electron Cycles or any person trading on or behalf of the business known as Electron Cycles from any liabilities, therein known as Electron Cycles (expressed or implied, arising by law or otherwise) that may occur from the use of products sold by Electron Cycles and purchased by Buyer. These products are being sold for “Off Road/Competition Use” only and may be used only on two wheel vehicles (bicycles, electric bicycles, two wheel electric powered vehicles) used solely for “Off Road/Competition” (off-road being defined as a private land with land owners permission and not public highway or byway). The Buyer also recognises that Lithium batteries are classed as hazardous and should not be: stored, used, charged in place, facility any area that is not fire proof or safe to do so. That batteries should not be taken into the family home, office, workplace or school place. No other applications are intended or implied. The Buyer of product sold or provided by Electron Cycles acknowledges and agrees that Seller disclaims any warranty and expressly disclaims any liability for personal injury or damages or any damages to vehicle, expensed occurred, personal property or third persons. Electron Cycles will uphold the warranty of the manufacture of the product sold for a minimum of six months from date of purchase from manufacturer defect. In the event a manufacturer’s warranty exists, it is agreed and stated that Under no circumstances shall the seller or manufacture be liable for any labour charged or travel time incurred in diagnosis for defects, removal, or reinstallation of this product, or any contingent expenses.







Additional information

Weight 11 kg
Dimensions 53 × 26 × 36 cm