On the 2 turbo modes it lists x minutes +xx additional time... What's the additional time?

on the full batteries, it runs on turbo for x minutes, then steps down to the next high level to run for additional xx minutes

Does this light have low voltage protection to protect the batteries from overdischarging?

I measured this, and the answer is that this flashlight overdischarges the batterycells. My lab power supply indicates 13.2V as the point where the red LED switches on, That is 3.3V per cell, way too low! A Lithium Ion cell should not be discharged below 3.71V! That is at 15% of capacity. 20% would be ideal. I don’t know whether I can adjust this threshold point. I thinks it is unlikely something I could adjust, since I have no electronic documentation. I needed to ask the Shenzen manufacturer.

Is this one rechargeable?

no, X45 is not rechargeable. You will need to charger to charge the batteries

why does in the top of the announcement it says it has 18000 lumens and 660m range but on the bottom it says it has 16500 and 583m range?

It is the GEN II 18000 lumen one. Once a product enters into the Amazon catalog, it is not easy to change the description. Each time, we have to file an application for the Amazon catalog team to update the description. Often they don't do it right or complete. But all we have now are the updated GEN II 18000 version

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Description

🚀 Light up your legacy with the Acebeam X45—where power meets precision.

RUGGED READY - Crafted from aircraft-grade aluminum with a premium anti-abrasive finish to withstand the toughest conditions.
BLINDING BRIGHTNESS - Illuminate your world with a staggering 18,000 lumens—never miss a detail, day or night.
MARATHON BATTERY LIFE - Stay powered for up to 310 hours on a single charge—perfect for extended adventures or emergencies.
PRECISION BEAM CONTROL - Orange-peel reflector and AR-coated ultra-clear glass deliver a sharp, long-distance beam up to 583 meters.
SMART THERMAL MANAGEMENT - Automatically steps down brightness to prevent overheating, ensuring reliable performance when you need it most.

The Acebeam X45 CREE XHP70.2 GEN II LED Flashlight delivers an extraordinary 18,000 lumens of neutral white light with a beam distance of up to 583 meters. Built from durable aircraft-grade aluminum and featuring IPX8 waterproofing, it offers up to 310 hours of runtime on a single lithium-ion battery charge. Advanced thermal regulation and a premium optical system ensure consistent, reliable illumination for professionals and outdoor enthusiasts alike.

Specifications

Special Feature	Durable
Color	Orange, White
Power Source	Battery Powered
Light Source Type	LED
Material	Aluminum
White Brightness	18000 Lumens
Included Components	Battery
Voltage	12 Volts (DC)
Battery Cell Composition	Lithium Ion
Item Weight	535 Grams
Water Resistance Level	Waterproof
Warranty Type	limited warranty
Brand	ACEBEAM
Brightness	18000 Lumen
Battery Description	Lithium-Ion
Style	Modern
Finish Type	White
Mounting Type	Handheld
Manufacturer	Acebeam
Part Number	Acebeam-X45-5000K
Item Weight	1.18 pounds
Item model number	Acebeam-X45-5000K
Finish	White
Shape	Cylindrical
Special Features	Durable
Description Pile	Lithium-Ion

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