Overview
The LiitoKala Lii-40A-N 21700 4000 mAh is a nickel-tab version of LiitoKala’s high-drain 21700 cell, purpose-built for battery pack manufacturers and DIY builders. It delivers 4000 mAh of capacity with ≤20 mΩ internal resistance, ensuring both long runtime and efficient discharge. Pre-welded nickel strips simplify parallel or series connections, making this cell ideal for large-capacity pack configurations.
Main Features
- 4000 mAh capacity, 3.7 V nominal voltage
- Factory-welded nickel tabs for easy pack integration
- Low ≤20 mΩ internal resistance for efficient current flow
- Up to 1000 charge cycles for long-term reliability
- Same cell chemistry as standard Lii-40A with added convenience for assembly
- Genuine LiitoKala production, safety-tested and consistent
Technical Specifications
| Parameter | Specification |
|---|---|
| Brand Name | LiitoKala |
| Model | Lii-40A-N (Nickel) |
| Type | Li-ion 21700 Rechargeable Battery |
| Nominal Capacity | 4000 mAh |
| Nominal Voltage | 3.7 V |
| Limited Charge Voltage | 4.2 V |
| Working Voltage Range | 2.75 – 4.2 V |
| Internal Resistance | ≤ 20 mΩ |
| Recharge Cycles | Up to 1000 |
| Weight | 65 g ± 1 g |
| Size | Ø 21.5 mm × 70.5 mm |
| Top Type | Flat Top with Nickel Tabs |
| Customization Options | Nickel / Pointed / PCB |
| Package Details | 256 pcs / box (22 × 22 × 18 cm) |
Applications
The Lii-40A-N is designed for battery pack assembly across e-bikes, scooters, solar systems, and portable energy devices.
Its welded nickel tabs allow quick integration into 3S, 4S, 7S, 10S or higher-voltage battery groups for power tools and lighting systems.
Because of its low internal resistance and long life, it’s also favored by DIY builders, industrial integrators, and RC enthusiasts seeking high-performance 21700 cells.
Product FAQ
What’s the difference between Lii-40A and Lii-40A-N?
The Lii-40A-N is the same 21700 cell but comes with pre-welded nickel tabs for direct spot-welding into battery packs.
Can I use Lii-40A-N as a drop-in replacement for a standard 21700?
Yes, electrically it’s identical, but ensure your device has clearance for the nickel tabs.
What’s the internal resistance?
≤ 20 mΩ, providing efficient discharge and minimal heat generation.
What charger should I use?
Use a LiitoKala smart charger such as the Lii-C6 Smart Charger for accurate charging.
Can I use it in series/parallel configurations?
Yes — the nickel tabs simplify safe series and parallel pack assembly.
Is the cell protected?
No, this version is unprotected; PCB protection can be added as a custom option.
Do you offer OEM or bulk orders?
Yes — visit our Bulk Batteries page for wholesale inquiries.
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