52v 19.5Ah 1015Wh Polly Long Range Down Tube Battery Panasonic Tesla 21700 Cells + 4A Charger

Original price was: £529.00.Current price is: £499.00. (price including VAT)

52v 19.5Ah 1015Wh Polly Long Range Down Tube Battery Panasonic Tesla 21700 Cells + 4A Charger


UK Stock, No Import tax, No Waiting, No China returns!!!!

UK Warranty

52v 19.5Ah 2015Wh Polly Long Range Down Tube Battery Panasonic Tesla 21700 Cells + 4A Charger 

UK Stock

Long range 14S4P 52v 19.5Ah Panasonic Tesla 21700 (4850 mAh  per cell and) with 4Ah UK charger. 50Amp Nominal BMS. 4p x 10A cells  and designed for 1600w max motors and pure nickle welded contacts). Downtube type battery, designed to fit on down tube utilizing water bottle bolts. These cells are volumetrically much bigger than the 18650 and hence give more power per cell and less welds. These are Branded specifically designed for medium output discharge and sustained medium/high drain. Other inferior cells used in cheaper packs simply can’t deliver like these. If you think the cost is high, these batteries have 56 cells (14s4p) that retail in the UK for around £6 each! not including: BMS, casing , charger, shipping taxes AND FABRICATION. These batteris have been spacifically designed for the bafang BBSH, CC Stealth and 1000/1500w hub motors

We do not recommend these batteries for power output above 40A (1600watts), these will handle all 40A or lower 48/52V applications but have been specifically built for the Bafang BBSHD and 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  your shelf”  batteris that are found similar to by othe 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, We 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 maybe 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 19.5Ah
Nominal Capacity (AH) 19.5Ah
Nominal Voltage (V) 51.8V
Source Resistance (mΩ) 12-14
Cell Specification 3.7V 4850mAH 3C Powerful Panasonic Tesla NCR21700T Cell
Cell Combination 14-series, 4-parallels
Cell Size 21700 Cylinder Cell
Diameter: 21mm, Height: 70mm
Cell Quantity (parallel*series) 56 pcs
Discharge Cutoff Voltage (V) 43  +/- 1V
Charge Cutoff Voltage (V) 58.8V
Rated Discharge Current (A) 19.5A
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 11.5 hours
Fast Charge Current (A) 5A
Charge Time under Fast Charge Current 4.6 hours
Charge Temperature Range 0 – 60 ℃
Discharge Temperature Range -20 – 60 ℃
Battery Size 368*125*95mm
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 1600W 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 over miss use 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.

Discounted when bought as a complete kit with BBSHD.


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 period 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.

Lithium batteries by nature are considered hazardous items and should never be brought in to the family home or any other structure where fire may cause risk to: life, injury or possession. Batteries should always be charged and stored in a safe fireproof place. While being used, the safety to others and others property must be considered and is the direct responsibility of the purchaser. Any harm to the purchaser or other third parties or property is not the responsibility of Electron Cycles or any person trading on or behalf of the business known as Electron Cycles and   hold no responsibility either implied or otherwise for mechanical, electrical or other failure when using any products or any costs or damages resulting from these items purchased or otherwise obtained from Electron Cycles or any person trading on or behalf of the business known as Electron Cycles




Additional information

Weight 8 kg
Dimensions 45 × 18 × 16 cm