10,400mAh Waterproof Bike Light Battery - Now Higher Capacity - Works with Most CREE 8.4v LED Bike Lights, and All Our 8.4v Lights (Blaze, Helios and Stamina Models)

This is a better battery than came with the light. It holds more power so I charge it less. Only real improvement I can see would be to include a push button meter like drills all have now. This has a hard shell vs the original that had a rubber surround but it also is shaped so it can strap to the bike well. My only worry is that it might crack or something if it’s dropped or somehow were to fall off the bike which isn’t very likely. It’s a little bigger in size compared to original battery as well. When I use the light as a headlamp instead of on the bike I just Velcro the straps around my belt and it works well enough for me. Makes for a nice light for long hikes, the run time outweighs the weight of the light for me as I need no extra batteries.One note but might be perceived and not real: seems to hold charge best when you keep the light unplugged when not in use.Recommend for anyone who has the original battery, plus having two batteries means it’s never an issue on longer rides. Keeps you good and visible at night.

By this one

I had the original bright eyes lights five years ago or more. Had to get different lights because the battery would not run for two hours. This new bigger battery has yet to even run low after two hours.

so nice

I ordered this battery twice and both times it did not come with the charger when selecting the bundle version. The battery works great though. I would give 5 stars if I received the charger.

This is my second battery pack from Bright Eyes and just like the first one, the durability and longevity is great. But I have to agree with another review that the mounting system needs help. The straps aren't log enough to wrap around a seat tube or downtube and then have something to secure it back to. There needs to be some velcro added to the body of the battery pack for the straps to secure to. I ended up having to use my water bottle cage to put the battery pack in and then I could secure the straps. BE, bring back the original mounting option like on the 6400mAh Battery.

Has the rated capacity, weatherproof, works as advertised and they seem to have fixed the problematic connector on the older revisions where the contacts would slowly corrode over time.It does seem to have a higher self-discharge than I would've liked, but I commute by bike on a near-daily basis, so it gets charged almost every night anyway.

Tested it out after a rise to see how much longer it had. 7 hrs on high. Pretty impressive.