I would like a second battery pack to attach when the first one is completed. I ride on remote trails for extended periods at night. Where may I buy?

Don't forget you can also buy lithium cells and battery packs that come with something other than 18650 cells. For example, a pair of decent quality 21700 or 26650 lithium-ion cells in 2S1P configuration can provide a LOT more Ah than a pair (2S1P)...or even a quad (2S2P) of decent quality 18650 cells. A 21700 cell of the same chemistry can provide about 50% MORE POWER for ALMOST the same physical cell outside dimensions (18650 v 21700: 18 to 21 = just 3mm wider diameter, and 65 to 70 = just 5mm longer (the last 0 in the number means it's a cylinder)). In practical terms it means by using 21700's instead of 18650's, you can get either longer run-times per charge or the cell's lifespans can be increased due to lower stress on them in fewer discharge/recharge cycles. I recently purchased a pair of Samsung 21700 5,000mAh cells (REAL mAh value...not a fake marketing claim) for $26, already packaged as 2S1P (8.4V) with a battery protection circuit. Two of those packs in a 2S2P configuration would fit in one of these FLEXIBLE fabric battery bags with no problem, providing a REAL 10,000mAh battery pack. (NOTE: way too many companies make fake claims about the mAh capacity of the 18650 lithium-ion cells they sell. Any mAh claim over 3200mAh for a 1S1P configuration 18650 cell is in general VERY suspicious, and is certainly not going to be cheap. Similarly any 2S2P (4*18650) configuration 18650 8.4V pack claiming more than 6400mAh is just as suspicious). I recommend reading batteryuniversity website.

I have just purchased this product and have two questions. 1) Is this 4000 Lumens? 2) How long does it take to full charge the battery?

I don't think it's 4000 lumens but it is plenty bright for fast night riding on a bicycle. It took 5 hours to fully charge for the first time.

This light has an uncanny resemblance (both in looks and price) to the "OXY LED BL-15" light, is the performance the same?

Not sure about the OXY comparison. I've had mine about three months. Definitely lives up to brightness claims. On high setting it gets around 2 hours. It has a flashing mode and three brightness settings. The battery is a little awkward. I put in in an empty water bottle and wrap the cord around top tube. I just use it for commuting, so not sure where I'd put the battery if I needed both water bottles. The rubber bands which attach to handlebars are a weak point as I have already broken one and worry about them snapping as I ride. Overall satisfied with the product.

ASIN	B00Y441QT2
Auto Part Position	Front
Best Sellers Rank	#370,930 in Sports & Outdoors ( See Top 100 in Sports & Outdoors ) #389 in Bike Headlights
Brand	TANSOREN
Brand Name	TANSOREN
Brightness	4000 Lumen
Color	Black
Customer Reviews	4.5 4.5 out of 5 stars (674)
Date First Available	May 23, 2015
International Protection Rating	IP66
Item Dimensions LxWxH	6.3 x 6.3 x 1.85 inches
Item Package Dimensions L x W x H	7 x 5 x 2.4 inches
Item Weight	250 Grams
Light Output Maximum	4000 Lumens
Manufacturer	TANSOREN
Material	Plastic, Rubber
Mounting Type	Handlebar Mount
Number of settings	4
Package Weight	0.52 Kilograms
Part Number	TSRBHLA8H
Power Source	Battery Powered
Product Dimensions	6.3"L x 1.85"W x 1.06"H
UPC	706551067898
Water Resistance Level	Waterproof

TANSOREN 4000 Lumens Bright Waterproof Bike Headlight with LED Light

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