SPERAS i4 Charger 4 slot Charger 21700 Charger

Streamlined 4-Slot Power

SPERAS i4 Smart LED 4-Slot Battery Charger

Maximum reliability without the complexity. The SPERAS i4 is a rugged, highly efficient 4-bay charger featuring clear LED indicators, up to 2A fast charging in the fourth slot, and automatic intelligent charging modes (CC, CV, dv/dt) to keep all your Li-ion and Ni-MH batteries performing at their peak.

Feature	i4 (Streamlined Efficiency)	🔥 D4S (Premium Display)
Display Type	Clear LED Indicator Bars	High-Definition LCD Screen
Charging Slots	4 Independent Slots	4 Independent Slots
2A Fast Charging	Dedicated 4th Slot	Auto-Selected by Charger
Best For	Rugged, simple, cost-effective charging	Users who want exact voltage/data readouts

Core Professional Features

What is the main difference between the i4 and the D4S?

The SPERAS i4 is a streamlined, highly reliable model that uses simple LED indicator bars to show charging progress. The D4S is the premium version that features a full LCD screen for exact digital readouts. Both safely charge 4 batteries independently.

Which slot should I use for 2A fast charging?

On the SPERAS i4, the fourth slot (far right) is specifically designed to provide up to 2A of rapid charging current. We recommend placing your highest-capacity batteries (like a 21700 or 26650) in this slot when you need them charged as quickly as possible.

What do the CC, CV, and dv/dt charging modes mean?

These are automatic smart charging phases designed to protect your battery. The i4 uses CC (Constant Current) to charge quickly when the battery is low, switches to CV (Constant Voltage) to safely top it off, and uses dv/dt (Delta Voltage) termination for Ni-MH batteries to prevent overcharging.