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Free shipping on all order above $49.99 to most countries.
Most flashlights can directly get 5 years warranty; battery and accessories get 1 year warranty.
Any questions, please email to info@sperasflashlight.com
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Need 4 charging slots? Choose between the streamlined, rugged efficiency of the i4 or the premium display feedback of the D4S.
| 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 |
Don't throw away "dead" batteries just yet. The SPERAS i4 features an advanced Li-ion battery restoration function that can safely activate and revive over-discharged cells. Combined with automatic termination upon charging completion, it ensures your batteries are both recovered and protected from overcharging.
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.
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.
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.


