The ones I've seen claim to be "constant voltage", which I took to mean that they are always 1.5 V right up to the point that they need recharging. That would m

The ones I've seen claim to be "constant voltage", which I took to mean that they are always 1.5 V right up to the point that they need recharging. That would make the battery level indicator in many devices report 100% right up until the end, which would be pretty annoying in a lot of cases. What I want is a variable buck converter (if the real cells are lithium) or variable buck-boost (if the real cells are NiMH) that adjusts the output so that a battery level indicator that expects alkaline batteries will show the correct battery level.