Review on USB Rechargeable Lithium D Batteries - 1.5V / 4000MAh (2-Pack) - ECO-Friendly & Recyclable - No Memory Effect - Not NI-MH/NI-CD/Alkaline Batteries by Lisa Frank
They work fine, but seem a little smaller than standard D cell.
I'm mostly happy with these. The only con I've seen is that they have some connection problems. They don't seem to be exactly the same size as a D cell, so they wiggle around (in a mag light in my case.) This causes the connection to be intermittent unless I adjust the spring in the base of the light to make it a tighter fit. If I buy more lion batteries, I'd definitely move in the direction of the ones with a micro USB charge porton the side instead of these that have a removable cap and full size USB-A port.
- Works great so far, but I haven't had them long enough to answer longevity or life
- Bought this product in January of 2022. For of the batteries will no longer charge
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