If you have a a device that does not tolerate the lower voltage, check out NiZn rechargables. They top out at ~1.7 V when full and keep their voltage quite high until they are almost flat. (At which point they should be immediately recharged, they don't take deep discharge well.)

I use them almost everywhere nowadays. Most devices tolerate the slightly higher voltage and even expensive hardware usually cheaps out on proper battery circuitry.