SPERAS PD2170 Power Bank… — Speras Flashlight

Name: SPERAS PD2170 Power Bank Charger 21700 18650 Charger
Brand: Speras Flashlight
Availability: InStock

Why the PD21700 Outperforms the Competition

Most chargers do one thing. The PD21700 works twice as hard, bridging the gap between tactical gear maintenance and everyday digital survival.

Feature	Standard Chargers	🔥 SPERAS PD21700
Functionality	Charger Only	2-in-1: Charger + Power Bank
Slot Control	Shared Current	Independent Detection & Control
Battery Health Tech	Basic Trickle	TC/CC/CV 3-Stage Charging
Conversion Efficiency	~70% - 80%	Up to 90% Efficiency

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.

SPERAS PD21700 functioning as a portable power bank to charge mobile devices via USB

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.

Independent dual-slot charging technology for 21700 and 18650 batteries with LED indicators

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.

SPERAS charger multi-layer safety protection system including flame retardant materials

PD21700 Design & Dimensions

Compact dimensions of the PD21700 charger: 110x48.4x28.9mm

SPERAS PD21700 packaging and included charging accessories

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

Frequently Asked Questions

How exactly does the Power Bank feature work?

Once you have charged 18650 or 21700 batteries inserted into the PD21700, you can plug your standard USB charging cable into the output port and connect it to your phone, tablet, or GPS. The parallel balance discharge tech will safely draw power from your batteries to charge your digital devices, making it perfect for emergencies and camping.

Can I charge one 21700 and one 18650 at the same time?

Yes! The PD21700 features independent slot control. The built-in microcomputer will automatically detect the voltage and manage the optimal charging current for each battery separately, ensuring safe and efficient charging even with mixed battery sizes.

Is it safe to leave my batteries on the charger overnight?

Absolutely. The charger utilizes a smart TC/CC/CV 3-stage process and will automatically and precisely cut off power once the battery hits 4.2V. Coupled with overcharge, overheat, and reverse-polarity protections, as well as a flame-retardant body, it is completely safe for unattended charging.

SPERAS PD2170 Power Bank Charger 21700 18650 Charger

About SPERAS PD2170 Power Bank Charger 21700 18650 Charger

SPERAS PD21700 Smart Battery Charger & Power Bank