Question 1

can it be used while charging?

Accepted Answer

Yes - as stated by Cam, you can connect the light to an external mobile battery pack (e.g., Anker 20,000 mAh, etc.), but be sure and protect your connections at the light and at the battery if riding in inclement weather; by charging while using, you risk sacrificing some of the weatherproof protection normally afforded by the charging port cover; this applies not only to driving rain...   but also road spray generated from the front tire up into the light;

Question 2

Does this recharge with mini usb or micro usb?

Accepted Answer

Micro USB... same type the ps4 and modern smart phones use.

Question 3

What size bar/tube is the clamp made for?

Accepted Answer

Very small diameter. Would not fit around the fat part of handlebars next to the top tube even with rubber removed. Had to return.

Question 4

What is the battery wattage? I want to take mine on a flight but can't figure out if I should put it in my carry on or checked baggage.

Accepted Answer

If you're worried about taking it on a plane, you want capacity (Watt-hours), not power (Watts).

Cygolite doesn't list battery capacity, but I did some math, and it's probably in the 15-25 Wh range and definitely under 50 Wh. It's going to be a little less than the capacity of a similarly-sized USB power bank, since both are mostly filled with battery, but this has the lighting components as well.

The math, if you're curious:

Most likely, they're using an 18650 or 21700 cell. A 21700 is 21 mm in diameter and 70 mm in length, or 24.2 mL. Wikipedia says the energy density of a Li-Ion battery can be up to 693 Wh/L. If they used a maximally-dense 21700 , it would be 16.8 Wh.

The highest-capacity 21700 cell that Battery Junction sells is 5100 mAh. The nominal voltage of Li-Ion cells is 4.2 V. If they used one of these 21700 cells, it would be 21.42 Wh.

Amazon says this light weighs 6.4 oz, or 181.4 g. Wikipedia says the specific energy of a Li-Ion battery can be up to 265 Wh/kg. If the *entire* light were made of battery, it would be 48.1 Wh.

ASIN	B01N4ANAPU
Auto Part Position	Front
Best Sellers Rank	#19,251 in Sports & Outdoors ( See Top 100 in Sports & Outdoors ) #18 in Bike Headlights
Brand Name	Cygolite
Color	Black
Customer Reviews	4.5 4.5 out of 5 stars (1,326)
Global Trade Identification Number	00745025060041
Included Components	Locktite handlebar mount, Metro Pro 100 bicycle headlight, Micro USB charging cable
International Protection Rating	IP67
Item Dimensions L x W x H	3"L x 1.3"W x 1.3"H
Item Type Name	bike light
Item Weight	6.4 ounces
Light Output Maximum	1100 lumens
Manufacturer	Cygolite
Manufacturer Part Number	MTR-1100-USB
Material Type	Plastic
Model Number	MTR-1100-USB
Mounting Type	Handlebar Mount
Number of Items	1
Number of Pieces	1
Number of settings	9
Power Source	Battery Powered
UPC	745025060041
Unit Count	1 Count
Warranty Description	One Year Limited Warranty
Water Resistance Level	Water Resistant

Metro Pro 1100

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