Tenpower INR21700-40TG 4000mAh - 35A
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TENPOWER | LONDON VAPE WHOLESALE
HIGH-DISCHARGE 21700 BATTERYTenpower INR21700-40TG 4000mAh 35A Battery Wholesale UK
Discover the Tenpower INR21700-40TG rechargeable lithium-ion battery at London Vape Wholesale. Featuring 4000mAh nominal capacity, a manufacturer-rated 35A maximum continuous discharge current and a flat-top 21700 design, this high-discharge cell is intended for suitably protected electronic equipment.
PRODUCT HIGHLIGHTS
4000mAh Capacity • 35A Manufacturer Rating • 21700 Size • 3.6V Nominal Voltage • Flat-Top Terminal • Rechargeable Li-ion • Unprotected Cell
Important: This is an unprotected lithium-ion cell. Use only with equipment providing appropriate battery protection. Independent testing guidance recommends a conservative 30A continuous limit.
Tenpower INR21700-40TG – Product Overview
The Tenpower INR21700-40TG 4000mAh 35A is a rechargeable lithium-ion battery cell manufactured in the 21700 cylindrical format.
Combining a 4000mAh nominal capacity with a manufacturer-specified 35A maximum continuous discharge rating, the 40TG is designed for applications requiring a balance between energy capacity and high-current capability.
The battery operates at a 3.6V nominal voltage, with a maximum charging voltage of 4.2V. Its flat-top positive terminal is intended for equipment specifically designed to accept this connection type.
Unlike protected consumer battery packs, the INR21700-40TG is an unprotected individual cell. It does not include an integrated protection circuit, making correct device compatibility, charging and handling particularly important.
London Vape Wholesale supplies this model for customers requiring the Tenpower 40TG specification. Confirm the exact quantity, packaging and stock availability when ordering.
Tenpower INR21700-40TG Key Features
4000mAh Nominal Capacity
The battery provides a nominal capacity of 4000mAh, offering energy storage for suitable rechargeable battery systems. Actual usable capacity depends on load, temperature, discharge cut-off and cell condition.
35A Maximum Continuous Discharge Rating
Tenpower specifies a maximum continuous discharge current of 35A. Independent battery-testing guidance recommends a more conservative 30A continuous limit to manage operating temperature. Always apply suitable safety margins.
High-Discharge 21700 Format
The 21700 cylindrical form factor is designed for compatible battery compartments and holders. Its dimensions differ from 18650 and 20700 cells.
3.6V Nominal Voltage
The INR21700-40TG has a nominal voltage of 3.6V and a specified full-charge voltage of 4.2V. Battery voltage varies throughout the discharge cycle.
Flat-Top Positive Terminal
The flat-top terminal is designed for compatible electrical contacts. Some battery-powered devices require button-top cells and will not accept this configuration.
Rechargeable Lithium-Ion Chemistry
The cell uses rechargeable lithium-ion chemistry and must be charged using a suitable lithium-ion charger with the correct charging profile and safety controls.
Unprotected Battery Construction
The cell does not contain an internal protection circuit. The host device or battery system must provide appropriate overcharge, over-discharge, overcurrent, temperature and short-circuit protection.
Designed for Compatible High-Current Systems
The combination of capacity and discharge capability makes this cell an option for suitably engineered battery applications. Compatibility must be determined from the equipment manufacturer's requirements, not battery size alone.
Tenpower INR21700-40TG Technical Specifications
| Brand | Tenpower |
| Model | INR21700-40TG |
| Battery Type | Rechargeable Lithium-Ion Cell |
| Battery Size | 21700 |
| Chemistry | INR / Lithium-Ion |
| Nominal Capacity | 4000mAh |
| Nominal Energy | 14.4Wh |
| Nominal Voltage | 3.6V |
| Maximum Charging Voltage | 4.2V |
| Discharge Cut-Off Voltage | 2.5V (Manufacturer Test Specification) |
| Manufacturer Maximum Continuous Discharge | 35A |
| Conservative Independent Continuous Rating | 30A Recommended by Independent Testing Guidance |
| Standard Charging Current | 2A |
| Manufacturer Maximum Charging Current | 6A Under Specified Conditions |
| Positive Terminal | Flat Top |
| Protection Circuit | None – Unprotected Cell |
| Rechargeable | Yes |
| Maximum Dimensions | 21.3mm Diameter × 70.3mm Height |
| Manufacturer Maximum Weight | 70g |
| Approximate Listed Weight | 67g |
| Battery Charger Included | No |
| Wholesale Supplier | London Vape Wholesale |
Specifications are based on Tenpower's published INR21700-40TG datasheet and the listed product configuration. Manufacturer maximum ratings are not recommended everyday operating targets. Consult the latest manufacturer documentation for engineering and safety requirements.
Understanding 4000mAh Capacity and 35A Discharge
4000mAh – Nominal Capacity
The capacity rating describes the charge the cell can deliver under specified test conditions. It does not guarantee a fixed operating time in every device.
35A – Manufacturer Maximum Discharge
Tenpower specifies 35A as the maximum continuous discharge current. Actual operating limits depend on cell temperature, cooling, battery condition and the protection system. Independent testing guidance recommends limiting continuous current to approximately 30A.
3.6V – Nominal Voltage
The cell operates across a voltage range during use. It charges to 4.2V and must be protected against excessive discharge. The manufacturer's 2.5V cut-off is a test specification, not a reason to bypass device protection.
Tenpower 40TG vs Tenpower 50ME
Both models are rechargeable flat-top 21700 lithium-ion cells, but they are designed around different capacity and discharge characteristics.
| Specification | 40TG | 50ME |
|---|---|---|
| Nominal Capacity | 4000mAh | 5000mAh |
| Manufacturer Maximum Continuous Discharge | 35A | 15A |
| Nominal Voltage | 3.6V | 3.6V |
| Format | 21700 Flat Top | 21700 Flat Top |
| Main Distinction | Higher Discharge Capability | Higher Energy Capacity |
These cells are not automatically interchangeable. Device compatibility must be assessed using the full electrical, mechanical and protection requirements.
Tenpower INR21700-40TG Compatibility
The INR21700-40TG is intended for equipment that specifically supports an unprotected, flat-top 21700 lithium-ion cell and provides appropriate protection.
Check Before Installing
- The device explicitly supports 21700 batteries.
- The battery holder accepts flat-top terminals.
- The equipment supports the correct lithium-ion voltage range.
- The maximum current demand remains within a safe operating limit.
- The device includes appropriate battery protection.
- The battery compartment accommodates the cell without damaging its wrap.
- The equipment manufacturer permits this type of removable cell.
Vape mod compatibility: Only use this battery in a regulated device whose manufacturer explicitly permits unprotected flat-top 21700 cells and whose electrical requirements are suitable. Do not use it in mechanical or otherwise unprotected devices.
Important: A 21700 cell must not be substituted for an 18650 or 20700 battery unless the equipment manufacturer explicitly supports the alternative format.
How to Charge the Tenpower INR21700-40TG Safely
Step 1 – Inspect the Cell: Check the insulating wrap, positive-terminal ring and battery casing for any damage.
Step 2 – Use a Suitable Charger: Select a quality lithium-ion charger that explicitly supports 21700 cells and 4.2V charging.
Step 3 – Check Polarity: Insert the battery according to the charger's positive and negative markings.
Step 4 – Select Appropriate Charging Conditions: Tenpower specifies a standard charge current of 2A. Higher charging currents require conditions permitted by the manufacturer's datasheet and suitable equipment.
Step 5 – Monitor the Battery: Charge on a stable, non-flammable surface away from combustible materials. Never leave charging batteries unattended.
Step 6 – Store Safely After Charging: Remove the battery when charging is complete and place it in an individual protective battery case if not immediately installed.
Important 21700 Lithium-Ion Battery Safety
Unprotected Battery – Safety Precautions
Incorrect handling of an unprotected lithium-ion cell can result in short circuits, overheating, fire or serious injury.
- Never carry a loose battery in a pocket or bag.
- Keep the battery away from keys, coins and other metal objects.
- Use an individual protective battery case for transport and storage.
- Never short-circuit, puncture, crush, bend or dismantle the cell.
- Do not use a cell with damaged wrapping or a missing insulating ring.
- Never exceed safe discharge or charging limits.
- Use only equipment with appropriate battery protection.
- Do not use the battery in mechanical or unprotected vape devices.
- Never leave charging batteries unattended or charge while sleeping.
- Do not expose the cell to excessive heat, water or direct sunlight.
- Never mix cells of different models, ages or conditions in a multi-cell battery system.
- Stop using a cell that becomes unusually hot, damaged or behaves abnormally.
- Keep batteries away from children and pets.
- Recycle spent batteries through an appropriate battery collection service.
How to Store Tenpower 21700 Batteries
- Store cells in a cool, dry environment.
- Keep each cell protected against accidental short circuits.
- Avoid excessive heat, direct sunlight and moisture.
- Never store loose cells with metallic objects.
- Follow the manufacturer's recommended state of charge for extended storage.
- Inspect stored cells before returning them to service.
- Keep battery storage areas inaccessible to children.
What's Included?
- Tenpower INR21700-40TG 4000mAh 35A Rechargeable Lithium-Ion Battery Cell – Quantity as Ordered
A charger, vape device and protective storage case are not listed as included. Confirm the supplied packaging and quantity before publication.
Frequently Asked Questions
What is the Tenpower INR21700-40TG?
It is a rechargeable 21700 lithium-ion cell with 4000mAh nominal capacity and a manufacturer-rated 35A maximum continuous discharge current.
What is the battery capacity?
The nominal capacity is 4000mAh, equivalent to approximately 14.4Wh at its 3.6V nominal voltage.
Is the Tenpower 40TG rechargeable?
Yes. It requires a compatible lithium-ion charger and appropriate battery protection.
What is the maximum continuous discharge rating?
Tenpower specifies 35A. Independent testing guidance recommends limiting continuous discharge to approximately 30A to help manage temperature.
What voltage does the 40TG use?
It has a nominal voltage of 3.6V and a maximum charging voltage of 4.2V.
Is this a flat-top battery?
Yes. The INR21700-40TG uses a flat-top positive terminal.
Does it have a built-in protection circuit?
No. The Tenpower 40TG is an unprotected cell and must be used only in suitable protected equipment.
Can I use the Tenpower 40TG in a vape mod?
Only if the regulated device manufacturer explicitly permits this type of unprotected flat-top 21700 cell and the operating current is safely within its limits.
Is the 40TG better than the 50ME?
They have different strengths. The 40TG has a higher manufacturer-rated continuous discharge current, while the 50ME has a higher nominal capacity. The appropriate choice depends on the device's requirements.
Can I use this battery instead of an 18650?
Not unless the equipment manufacturer explicitly supports the larger 21700 format.
What charger should I use?
Use a quality charger that supports 21700 lithium-ion cells and the correct 4.2V charging profile. Follow Tenpower's charging specifications.
How should I carry a spare 21700 cell?
Always use a protective battery case. Never carry a loose lithium-ion cell alongside metal objects.
Where can I buy Tenpower 40TG batteries wholesale?
The Tenpower INR21700-40TG is listed at London Vape Wholesale. Log in to your trade account to check current pricing and availability.
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Tenpower INR21700-40TG 4000mAh 35A Wholesale UK
Explore the Tenpower INR21700-40TG rechargeable lithium-ion battery at London Vape Wholesale. Featuring 4000mAh nominal capacity, 3.6V nominal voltage, flat-top 21700 construction and a manufacturer-rated 35A maximum continuous discharge, this battery is intended for compatible protected electronic systems.
Log in to your wholesale account to check current trade pricing, stock availability and ordering information.
Important Battery Safety Information: This is an unprotected rechargeable lithium-ion cell, not a complete consumer battery pack. It must only be used in compatible equipment with appropriate electrical and thermal protection. Incorrect charging, storage, installation or handling can cause overheating, fire or serious injury. Never short-circuit the cell, use damaged insulation, exceed safe operating limits or carry batteries loose. Tenpower specifies a 35A maximum continuous discharge rating; independent testing guidance recommends a more conservative 30A limit. Follow the manufacturer's latest specifications and applicable battery transport, storage and disposal regulations.