Polly DP7 Hailong eBike Battery – 36V, 48V, 52V, 60V & 72V | 25Ah–60Ah

High-Capacity Lithium Battery for Electric Bikes and Conversion Builds

Power your electric bike with the Polly DP7 Lithium-Ion eBike Battery, a high-capacity down-tube battery designed for compatible Hailong-style mounting systems and selected electric bike conversion builds.

Available in multiple voltage and capacity configurations, this battery is advertised for systems ranging from 36V to 72V, with capacity options from 25Ah to 60Ah. It features modern 21700 lithium cells, a built-in battery management system (BMS), and a 5A charger listed as included by the supplier.

Whether you're replacing an existing battery or building a custom electric bike, selecting the correct voltage, capacity, connector, and current rating is essential for safe and reliable operation.

Key Features

• Battery model: Polly DP7

• Battery chemistry: 21700 lithium-ion cells

• Voltage options: 36V, 48V, 52V, 60V, and 72V, subject to availability

• Capacity options: 25Ah, 30Ah, 35Ah, 40Ah, 45Ah, 50Ah, and 60Ah, subject to availability

• Built-in BMS: 80A protection board, according to supplier specifications

• Mounting style: Down-tube, Hailong-style battery

• Charger: 5A charger advertised as included

• Cycle-life claim: Supplier states more than 80% remaining capacity after 1,000 cycles

• Certifications: CE, FCC, and RoHS, as stated by the supplier

• Warranty: 1 year, according to the supplier

• Intended applications: Compatible with electric bicycles and conversion systems

Technical Specifications

Choose Your Battery Voltage

Select a battery voltage that matches your motor, controller, and electrical system.

• 36V: Used in compatible lower-voltage e-bike systems.

• 48V: Common in many commuter and conversion e-bikes.

• 52V: Requires a compatible 52V battery system and charger.

• 60V: Designed for compatible higher-voltage systems.

• 72V: Intended for compatible high-voltage conversion builds.

Important: Voltage options are not interchangeable. Confirm the exact requirements of your motor and controller before ordering.

Choose Your Battery Capacity

Capacity, measured in amp-hours (Ah), affects how much energy a battery can store. Higher-capacity options generally provide more stored energy at the same voltage, although actual riding range varies.

These figures are nominal estimates calculated as voltage × amp-hours. Actual usable energy and riding range depend on battery design and operating conditions.

Built-In 80A Battery Management System

The supplier lists an 80A BMS protection board. A BMS helps monitor battery operation and provides protection functions according to its design.

The battery's actual continuous and peak discharge capabilities must be confirmed with the seller. The BMS rating alone does not guarantee that the battery can continuously deliver 80A.

Hailong-Style Down-Tube Installation

The Polly DP7 is described as a down-tube battery for compatible Hailong-style mounting systems.

Before purchasing, check:

• Battery dimensions and mounting-rail compatibility.

• Connector type and polarity.

• Nominal battery voltage and fully charged voltage.

• Controller voltage and maximum current requirements.

• Available mounting space and frame clearance.

• Whether the selected battery configuration supports your motor and intended use.

A similar shape or matching connector does not automatically mean a battery is compatible.

Charger Compatibility and Safety

The supplier advertises a 5A charger. The charger's output voltage must match the selected battery configuration.

Typical full-charge voltages for common lithium-ion e-bike batteries are:

These values apply to common lithium-ion configurations; confirm the battery chemistry and exact charging specifications before use. Never connect a charger solely because its plug fits.

Battery Life and Warranty

The supplier claims the battery can retain more than 80% of its capacity after 1,000 cycles. Actual cycle life depends on cell quality, charging practices, temperature, discharge depth, storage, and operating conditions.

The supplier lists a one-year warranty. Confirm coverage, exclusions, and the claim process before purchasing.

What's Included

• 1 × Polly DP7 Hailong-style lithium-ion battery in the selected configuration

• 1 × 5A charger, advertised as included

• Mounting hardware or rail: confirm with the seller

• Keys and additional accessories: confirm with the seller

Shop eBike Batteries, Chargers & Accessories

Explore replacement batteries, chargers, and electric bike accessories at ChargeMyEBike.com:

https://chargemyebike.com/collections/collections-ebike-chargers-batteries-accessories

ChargeMyEBike.com — Power Your Ride. Charge Anywhere. Ride Longer.

1. Maintenance service: 800-cycle warranty. If there are any quality issues, please get in touch with us for free repair or replacement (if the battery damage is caused by personal behavior, the seller will not bear any losses or provide any services)
2. DDP services (the seller bears tariffs for the following countries): Russian Federation, Belarus, France，Ukraine, South Korea, Thailand, Singapore, Malaysia, Germany, Spain, Netherlands, Italy, Bulgaria, Belgium, Latvia, Poland, Denmark, Finland, Portugal, Sweden, Slovakia, Slovenia, Greece, Hungary, Czech Republic, Lithuania, Luxembourg, Romania, Ireland, Estonia, Austria, Croatia, Australia!

 

Charger Plugs and Discharge Connectors Optional:

1. Charger Plug: US, EU, UK, AU plugs optional; will provide according to the delivery country if not requested.
2. Discharge Connector: There are 9 kinds optional (Product standard with connector XT60)as below picture, will soldered with default female connector&extra male connector if without requested.
3. If you have any requirements about this, please leave a message in your order.

E-bike 36V 21700 Samsung battery Specifications:

Rated voltage: 36V
Rated capacity: 25ah/30ah/35ah/40ah/50ah/60ah
Type composition: 10S5P
Battery: Built-in 21700 Samsung battery
Model: Electric scooter/electric bicycle/lithium ion battery
Battery size: 368mm x 150mm x 95mm
Battery weight: about 6kg.
Charging method: CC / CV.
Standard charging current: 5A.
Maximum continuous charging current: 10A.
BMS: Maximum 100A,
Maximum peak current: 100A
Charging voltage: 42V
Discharge cut-off voltage: 29.6V
Cycle life: 1000+ times
Charging temperature: -15 to 65℃
Discharge temperature: -15 to 65℃
Protection function: overcharge, overdischarge, overcurrent, short circuit, balance
Applicable motor: 250w 350w 500w 750w 1000w 1500w motor
(Note: the battery voltage must match the motor)
The packing list includes:
1 * 36V lithium-ion battery pack (with box)
1 * 30 cm cable assembly
1 * 42v 5A charger

E-bike 48V 21700 Samsung battery Specifications:

Rated voltage: 48V
Rated capacity: 25ah/30ah/35ah/40ah/50ah/60ah
Type composition: 13S5P
Battery: Built-in 21700 Samsung battery
Model: Electric scooter/electric bicycle/lithium ion battery
Battery size: 368mm x 150mm x 95mm
Battery weight: about 7kg.
Charging method: CC / CV.
Standard charging current: 5A.
Maximum continuous charging current: 10A.
BMS: Maximum 100A,
Maximum peak current: 100A
Charging voltage: 54.6V
Discharge cut-off voltage: 39.2V
Cycle life: 1000+ times
Charging temperature: -15 to 65℃
Discharge temperature: -15 to 65℃
Protection function: overcharge, overdischarge, overcurrent, short circuit, balance
Applicable motor: 250w 350w 500w 750w 1000w 1500w 2000w motor
(Note: the battery voltage must match the motor)
The packing list includes:
1 * 48V lithium-ion battery pack (with box)
1 * 30 cm cable assembly
1 * 54.6v 5A charger

E-bike 52V 21700 Samsung battery Specifications:

Rated voltage: 52V
Rated capacity: 25ah/30ah/35ah/40ah/50ah/60ah
Type composition: 14S5P
Battery: Built-in 21700 Samsung battery
Model: Electric scooter/electric bicycle/lithium ion battery
Battery size: 368mm x 150mm x 95mm
Battery weight: about 7kg.
Charging method: CC / CV.
Standard charging current: 5A.
Maximum continuous charging current: 10A.
BMS: Maximum 100A,
Maximum peak current: 100A
Charging voltage: 58.8V
Discharge cut-off voltage: 42V
Cycle life: 1000+ times
Charging temperature: -15 to 65℃
Discharge temperature: -15-65℃
Protection function: overcharge, overdischarge, overcurrent, short circuit, balance
Applicable motor: 250w 350w 500w 750w 1000w 1500w 2000w motor
(Note: the battery voltage must match the motor)
The packing list includes:
1 * 52V lithium-ion battery pack (with box)
1 * 30 cm cable assembly
1 * 58.8v 5A charger

E-bike 60V 21700 Samsung battery Specifications:

Rated voltage: 60V
Rated capacity: 20ah/25ah/30ah/35ah/40ah/50ah/60ah
Type composition: 16S4P
Battery: Built-in 21700 Samsung battery
Model: Electric scooter/electric bicycle/lithium ion battery
Battery size: 368mm x 150mm x 95mm
Battery weight: about 7kg.
Charging method: CC / CV.
Standard charging current: 5A.
Maximum continuous charging current: 10A.
BMS: Maximum 100A,
Maximum peak current: 100A
Charging voltage: 67.2V
Discharge cut-off voltage: 51.2V
Cycle life: 1000+ times
Charging temperature: -15 to 65℃
Discharge temperature: -15 to 65℃
Protection function: overcharge, overdischarge, overcurrent, short circuit, balance
Applicable motor: 250w 350w 500w 750w 1000w 1500w 2000w motor
(Note: the battery voltage must match the motor)
The packing list includes:
1 * 60V lithium-ion battery pack (with box)
1 * 30 cm cable assembly
1 * 67.2v 5A charger

E-bike 72V 21700 Samsung battery Specifications:

Battery Voltage: 72V
Rated capacity: 25ah/30ah/35ah/40ah/50ah/60ah
Category: Li-ion Battery
Battery core: built-in 21700 Samsung battery
Array mode: 20S3P
Battery size: 368*150*95mm (the measurement may have an error of 1-2mm)
Battery weight: about 7KG
Voltage : Peak - 84V, working - 72V
Maximum constant discharge current: 90A
Peak current: 100A
Charging voltage: 84V
Charging Current: <10 Amps
Discharge cut-off voltage: 60V
Power: 300W-3000W
Application: E-bike battery, electric scooter, electric wheelchair
Charging method: CC/CV
Cycle life: 1000+times
Charging temperature: -15-65℃
Discharge temperature: -15-65℃
Protection function: overcharge, overdischarge, overcurrent, short circuit, balance
Applicable motor: 72V 250W-3000W motor
(Note: the battery voltage must match the motor)
The packing list includes:
1 * 72V lithium-ion battery pack (with box)
1 * 30 cm cable assembly
1 * 84v charger

Original 21700 battery 36V 48V 52V 60V 72V electric bicycle battery suitable for 250W 350W 500W 750W 1000W 1500W 2000W 3000W motor kit!

(Please note: The voltage of the ordered battery must be the same as the voltage of the motor accessories; otherwise, it may cause incompatibility between the motor and battery)

 

36V-72V Precautions for battery use:

1. Before first use, please fully charge the battery.
2. Do not immerse the battery in water or get the battery wet!
3. Do not reverse the positive and negative poles, or short-circuit the battery with wires or other metallic objects!
4. Do not nail, knock, step on the battery, or disassemble the battery and battery pack in any way!
5. It is forbidden to put the battery in the microwave oven, pressure vessel, or fire source!
6. If the battery emits odor, heat, deformation, discoloration, or any abnormal phenomena, please stop using it immediately!
7. Do not use the battery in direct sunlight or a high-temperature environment. Otherwise, the battery pack will overheat, affecting battery performance and shortening battery life!
8. The battery pack and charger should be stored in a clean, dry, ventilated place, avoid contact with corrosive substances, and away from fire and heat sources.
9. When the battery pack is to be stored for a long time, please charge the battery pack to about 50% capacity and store it in a dry and ventilated place, and charge it for 2 to 3 hours every 3 months.
10. If you have any questions about product quality, please contact us by email immediately; we will try our best to solve these problems!