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.

Color	Black
Brand	TANSOREN
Material	Plastic, Rubber
Power Source	Battery Powered
Water Resistance Level	Waterproof
Item Weight	250 Grams
Mounting Type	Handlebar Mount
Product Dimensions	6.3"L x 1.85"W x 1.06"H
Number of settings	4
Brightness	4000 Lumen
Auto Part Position	Front
International Protection Rating	IP66
Manufacturer	TANSOREN
UPC	706551067898
Item Package Dimensions L x W x H	7 x 5 x 2.4 inches
Package Weight	0.52 Kilograms
Item Dimensions LxWxH	6.3 x 6.3 x 1.85 inches
Brand Name	TANSOREN
Part Number	TSRBHLA8H

TANSOREN 4000 Lumens Bright Waterproof Bike Headlight with LED Light

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