FreeCycle 8.4v Rechargeable Battery Pack for Mountain Bike Light Bicycle Lights & Headlamps Silicone Waterproof Battery-Replacement 4 x 18650 Batteries (Choose 6400 or 8800 mAh)

Worked great but poor quality/design the wire snapped at the connector after frequent use. The connection is too tight.

It took about 10 hours to fully charge. Haven't tested it yet. Good sturdy padded carrier.I'll follow up later.3/5/19First charge takes a long time, now it takes about 3-4 hours. This battery pack is so much better than other brand less packs. It seems to last about 50% longer. Highly recommend it.

My smaller capacity batteries are better performers but for the price is a decent value. Would not buy to be your primary battery for night rides, good for backup.

This battery is VERY SMALL FOR HOW MUCH POWER IT HAS. The cloth velcro case it comes with is easy to remove, but holds nicely on the bike. The light I bought this for is https://www.amazon.com/gp/product/B01LX02DC2/ref=oh_aui_detailpage_o02_s00?ie=UTF8&psc=1And it is a great combo for the price!

My original Cree Bike Light's batteries lasted 8 hours on a charge. I could go on a night ride with confidence I could make it home. My first try with these replacement batteries had me rushing home after less than 30 minutes with no confidence at all I would make it!Irritated, I did some tests. Out of two batteries ( I bought two ), same light, multiple tests. Worst Performance Experienced Tested 24 minutes to Blue 95 minutes to Purple - critical low 122 minutes to deadBest Performance Experienced Tested 43 minutes to Blue 131 minutes to Purple - critical low 171 minutes to deadAgain, multiple tests over the two batteries in the same conditions with the same light. You have no confidence you can make it home on a two hour bike ride. Again, my original lights probably got me 8 hours.

I used it every times biking at nite, no complaint from me.

A++++

Good, Powerfull