These batteries last a long time on a charge. I bought s spare one and never needed it. I do rotate each battery and use them both when one runs out.

Always love the great quality of my PEAX gear!!!

Bought along with the headlamp as a backup. Takes a charge well (in the headlamp housing) and capacity seems excellent. Shipping was super quick, even to Alaska

I recently purchased a new spare battery for my Peax headlamp. I purchased one of the first ones when they were released and it's been flawless, with great battery life but I figured having a spare would be a good idea.

Great battery