I was just planning on buying a box of 50 of either Panasonic or Rayovac for storage. So this may be the answer to the question I haven’t asked yet.
I use Titanium Innovations for everyday use, but have heard they are not the best for storage.
Even if batteries have a 10 year shelf life, I have read to not use old batteries in multi-cell lights. So what is the longest you can keep them and safely use them in multi-cell lights.