Q: I can’t see the red charging light when I plug in the Mito Meter into my computer but in the instructions says there should be when plunging the meter into a USB socket.

A: Although going to the black plastic casing for the new Mito Meter was a brilliant idea in terms of aesthetics, you will not be able to see the red light in the black addition meters. This hasn’t phased me personally as the light was almost impossible to see on the white version unless you were in a dark room. The new instructions will reflect the change and note that you can’t overcharge the battery, so you can leave it on charge overnight.

Meanwhile, if you charge the MitoMeter for an hour, it should give you a full charge that can last up to 8 hours or so of running time. The battery should last you for years and can be easily replaced when the time comes.