Core Professional Features

More Than a Charger: It's a Power Bank

Equipped with innovative parallel balance charge-discharge technology, the PD21700 allows you to reverse the flow. Insert your charged 21700 or 18650 batteries, plug in your USB cable, and instantly use it as a high-capacity power bank to charge your smartphone, GPS, or other USB devices in an emergency.

Independent Dual-Slot Smart Control

Capable of charging two batteries simultaneously without interference. The built-in microcomputer independently controls each slot, automatically detecting the battery's voltage. Intuitive LED indicators clearly display the real-time charging status so you are never left guessing.

TC/CC/CV 3-Stage Charging

We protect your investment. The PD21700 utilizes advanced TC (Trickle Current), CC (Constant Current), and CV (Constant Voltage) three-stage charging to maximize your battery's lifespan. It achieves a power conversion efficiency of up to 90% and precisely cuts off at exactly 4.2V when fully charged to prevent degradation.

Multi-Layer Defense System

Safety is never an option; it's a standard. The charger features comprehensive protections including Reverse-Polarity, Short Circuit, Overcharge, and Overheat protection. Furthermore, the entire chassis is constructed from high-grade flame-retardant material for ultimate peace of mind.

PD21700 Design & Dimensions

Technical Specifications

• Compatible Batteries: 21700 and 18650 Li-ion batteries
• USB Input: 5V/2A
• DC Output: DC 4.2V / 1A * 2 slots OR 2A * 1 slot
• Dimensions: 110mm (L) * 48.4mm (W) * 28.9mm (H)
• Weight: 76.9g (net weight) / 146g (gross weight)

📦 What’s in the Box:

• 1 × SPERAS PD21700 Smart Charger
• 1 × USB Charging Cable
• 1 × User Manual