Overview
The LiitoKala Lii-50E 21700 5000 mAh is a next-generation high-capacity Li-ion cell offering exceptional energy density and stability. Built for users who demand longer runtimes without sacrificing safety, it combines a 5000 mAh rated capacity with ultra-low resistance for smooth, efficient discharge across a wide range of devices.
Main Features
- 5000 mAh nominal capacity and 3.7 V output for extended operation
- ≤ 20 mΩ internal resistance ensures efficient, cool discharge
- Up to 1000 recharge cycles under proper use
- 21700 format—higher energy density than 18650 cells
- Flat-top design, compatible with most 21700 holders
- Optional Nickel / Pointed / PCB protection versions
- Genuine LiitoKala cell, tested for stability and long-term reliability
Technical Specifications
| Parameter | Specification |
|---|---|
| Brand Name | LiitoKala |
| Model | Lii-50E |
| Type | Li-ion 21700 Rechargeable Battery |
| Nominal Capacity | 5000 mAh (4800 – 5100 mAh typical) |
| 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 times |
| Weight | 70 g ± 1 g |
| Size | Ø 21.5 mm × 70.5 mm |
| Customization Options | Nickel / Pointed / PCB |
| Package Details | 256 pcs / box (22 × 22 × 18 cm) |
Applications
The Lii-50E excels in flashlights, e-bikes, and energy-storage systems that require both endurance and output efficiency.
It’s also widely used in solar units, power banks, RC projects, and portable devices, where high-capacity 21700 cells provide longer runtime with reduced cell count.
For DIY battery packs and industrial builds, the low resistance and long life of the Lii-50E ensure dependable performance and consistent energy delivery.
Product FAQ
Is the Lii-50E protected?
The standard version is unprotected. PCB-protected variants are available upon request.
How does it differ from Lii-40A 21700?
The Lii-50E offers higher capacity (5000 mAh) for longer runtime, while the Lii-40A focuses on high-drain output.
What charger should I use?
Use a LiitoKala smart charger, such as the Lii-C6 Smart Charger.
Can it replace an 18650 battery?
No, the 21700 is larger. Check device compatibility before use.
Can it be used in packs?
Yes — suitable for series and parallel pack building when balanced with a proper BMS.
Is it safe for long-term use?
Yes, each cell is tested for consistency and built with safe Li-ion chemistry.
Do you offer bulk orders?
Yes — see our Bulk Batteries page for retailer and OEM pricing.
Reviews
There are no reviews yet.