Smarkey 8.4v Bicycle Bike Rechargeable Replacement Battery for LED XM-L T6 Bicycle Light, Headlamp, Head Light and Flashlight

It seems like a nice battery pack. but it tested below the rated capacity. I would recommend getting a similar one off of ebay there are more options.

I completely charged it, and several days later used it to power a 5-LED Sahara Sailor bicycle light. It worked well at first, but it didn't last even half a long as it should have. It was dead in about 45 minutes.I'm not a big fan of the Velcro straps. I attached it to the top tube, and it slides back and forth a lot. The rubber straps on the Stupidbright-style batteries are much better.

The light randomly shuts off. You might get 30 minutes of battery life. The changing of the light from green to red to indicate low battery is worthless.Do not dare to use this light on a bike. Especially in the woods. You will be stranded if you don't die from wrecking. Garbage product.

The package is great. It fits nicely on the bike and stays secure. Unfortunately, the battery performance is horrible. I got about 2 minutes on a full charge

Well contained and rugged to replace my old light battery packs..

Works great! Last 3 hours!

Quality construction, really good quality for the price.

Good battery works well hope it lasts