Currently I have five of these cells from the original dozen that I purchased. The failure mode for the seven discarded units has been the same in each case - complete and sudden failure of terminal voltage. Loading a piece of equipment with a complement of freshly charged Energizer NH15BP cells is no guarantee that the device will work an hour later when needed. DO NOT LEAVE HOME WITHOUT A SPARE SET OF THESE CELLS IN YOUR POCKET!In the approximately the same period that has seen seven out of 12 Energizer failures, the count has been zero for eight for Sony cells and one out of eight for Kodak units. This, in spite of the fact that the Energizer cells have increasingly been relegated to "spares" and haven't actually seen much real use in the last year or two.The Energizer cells were NOT from a single batch but were purchased four at a time over several months and even show some design differences in sealant colors etc. among the batches. Definitely off my buy list.