Lifehackist Li-Ion Customized USB Rechargeable Battery 3.7V for Bright Spokes Bike Wheel Lights
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In my case, I use it before going to bed. It's already charged when I wake up.
The lighting is fantastic. It is possible to carry a charged spare battery if you have extra batteries. It's a shame they're no longer available for purchase.
When you first plug it into the USB port on the plug-in end, a red light will illuminate. It is changed when the light changes to green. The light turns off after a while, so if it's not on, it's not charging.
The battery lasts for a few hours after a single charge.
Selected User Reviews For Lifehackist Li-Ion Customized USB Rechargeable Battery 3.7V for Bright Spokes Bike Wheel Lights
Because this battery was made specifically for some bicycle lights I own, it receives a 4-star rating. They received a five-star rating because it arrived quickly and in good working order.
It's simple to refuel them. The wheel lights last for about 6 hours after they've been charged. For me - 3 days. Every day, I ride for about two hours. The batteries had a 9-month life span.