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About this product
Smart 4-Slot LCD Charger
SPERAS D4S Smart Battery Charger
A compact, high-volume charger designed for flashlight users, hunters, outdoor kits, workshops, and anyone running multiple rechargeable batteries. The D4S combines four independent charging slots, automatic current selection, and a clear LCD screen so you can keep your cells organised, topped up, and ready to go.
4 SlotsIndependent charging channels
Up to 2ARapid charging for a single cell
LCDDisplays charging status clearly
Li-ion / Ni-MHSupports common rechargeable cells
Built for charging more batteries, more efficiently
The D4S is ideal when you use several flashlights, headlamps, hunting torches, or rechargeable accessories. Instead of charging one or two batteries at a time, it lets you manage up to four compatible cells at once.
4
Four Independent Slots
Charge different compatible battery sizes and chemistries at the same time. Each slot is managed independently for safer, more convenient charging.
A
Automatic Current Selection
The charger automatically chooses a suitable charging current from 0.5A, 1A, or up to 2A depending on the number of cells and charging conditions.
LCD
Clear Status Display
The front LCD screen gives a quick view of charging progress and battery status, making it easier to monitor multiple cells at once.
Charge mixed battery types with confidence
The D4S supports a wide range of popular rechargeable flashlight batteries including 21700, 26650, 18650, 16340, and 14500 Li-ion cells, as well as Ni-MH and Ni-Cd batteries.
Suitable for many rechargeable flashlight and outdoor-device batteries
Independent slot control for mixed charging setups
Automatic termination when charging is complete
Designed to activate and restore over-discharged Li-ion batteries
0.5A × 4Four-cell charging mode
1A × 2Two-cell charging mode
2A × 1Maximum single-cell output
5V / 2AUSB input rating
Smart charging protection
Designed for everyday charging safety, the D4S includes automatic charge termination, reverse polarity protection, short-circuit protection, and intelligent activation for over-discharged Li-ion batteries.
Automatically detects battery voltage
Automatically selects charging current
Helps preserve battery life by avoiding unnecessary overcharging
Compact enough for home, workshop, travel, or kit-bag use
Technical Specifications
Comprehensive product specifications for the SPERAS D4S Smart LCD 4-Slot Battery Charger.
Specification
SPERAS D4S
Product Type
Smart LCD 4-slot rechargeable battery charger
Model
SPERAS D4S
Charging Slots
4 independent charging slots
Input
USB input: 5V / 2A
Output Voltage
DC 4.2V
Output Current
2A × 1 slot, or 1A × 2 slots, or 0.5A × 4 slots
Charging Current Selection
Automatic current selection: 0.5A, 1A, or up to 2A depending on battery status and charging load
Display
LCD charging-status display
Compatible Li-ion Batteries
21700, 26650, 18650, 16340, 14500 and other compatible Li-ion rechargeable cells
Compatible Ni-MH / Ni-Cd Batteries
Compatible Ni-MH and Ni-Cd rechargeable batteries, including common AA / AAA style cells where physically supported
Independent Slot Control
Yes, each slot is controlled independently
Mixed Battery Charging
Supports charging compatible mixed battery sizes and chemistries at the same time
Completion Control
Automatic charging termination when complete
Safety Protection
Reverse polarity protection and short-circuit protection
Battery Recovery
Activation / restoration function for over-discharged Li-ion batteries