I just use airtags! But even at every 9-12 months, I just hate throwing a physical object away. The rechargables are very attractive! I'd guess if one wanted to really "close the loop" you could try charging off a dynamo hub but that seems.. potentially. silly and expensive.
Originally Posted by
noglider
What device of yours uses coin batteries rapidly? Most that I have use the energy sparingly. The one exception is my spoke lights.