Overview
The LiitoKala King4000-PCB is a high-capacity 3.7V 18650 Li-ion rechargeable battery equipped with an integrated PCB protection circuit. Designed for safety-critical and high-drain devices, it combines a 4000mAh capacity with dependable voltage stability and built-in overload protection.
Main Features
- 4000mAh high capacity for extended runtime and reliable discharge
- Integrated PCB protection circuit guards against overcharge, overdischarge, and short-circuit
- Explosion-proof safety valve ensures maximum operational safety
- Low internal resistance (≤25mΩ) for efficient energy transfer
- Rechargeable up to 1000 cycles, providing long service life
- 3.7V nominal voltage with wide discharge range (2.75V–4.2V)
- Suitable for high-drain and continuous-load devices
- Constructed with reinforced metal shell for durability and impact resistance
Technical Specifications
| Parameter | Value |
|---|---|
| Brand | LiitoKala |
| Model | King4000-PCB |
| Type | Li-ion 18650 Rechargeable Cell |
| Rated Voltage | 3.7V |
| Capacity | 3800–4000mAh |
| Charge Voltage | 4.2V |
| Working Voltage | 2.75–4.2V |
| Internal Resistance | ≤25mΩ |
| Recharge Cycles | Up to 1000 |
| Protection | PCB (Overcharge, Overdischarge, Short-circuit) |
| Size | 18.5 × 69.5mm |
| Weight | 50g ±1g |
| Shell | Explosion-proof metal casing |
| Operating Temperature | -20°C to +60°C |
| Packaging | 400pcs/box (42.5×22×16cm) |
Applications
Primary Uses:
Designed for flashlights, Bluetooth speakers, POS machines, and car DVRs, the King4000-PCB provides stable and secure 3.7V power for long operation cycles.
Extended Benefits:
Perfect for massagers, beauty instruments, and smart home electronics, where protection circuits are essential for battery safety and reliability.
Compatibility / Upgrade:
Compatible with devices requiring protected 18650 batteries and LiitoKala smart chargers such as Lii-100, Lii-202, and Lii-500. The built-in PCB adds 4mm in length, so confirm device fit before installation.
Product FAQ
What is the difference between King4000 and King4000-PCB?
The King4000-PCB includes a built-in protection circuit board (PCB) for enhanced safety, while the standard King4000 is unprotected.
What does the PCB protection do?
It prevents overcharge, overdischarge, and short-circuit, extending the battery’s life and ensuring device safety.
Can it be used in any 18650 device?
It fits devices compatible with protected 18650 batteries (69.5mm length). Check dimensions before use.
What are the main applications?
Ideal for flashlights, portable electronics, massagers, and recording devices needing consistent and safe power.
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