That was expected of course and so I plugged in the charger. That is where the problems started. After a few seconds on the charger the Nexus 7 started up. It showed the startup logo, but when it got to the normal screen a message said it was powering off and the screen started to flicker like crazy. A few seconds later it switched off. After a minute it powered up again, then shut down. This repeated.
A Google search revealed a few other people with this problem. I think the problem may be that there isn't sufficient power to charge the battery and run the device at the same time. It powers up and shows the screen, realises there's no juice in the battery and powers down. This cycle then repeats.
My solution, after a bit of trial and error, was to switch off the screen as soon as it appeared - the normal desktop screen, not the startup logos. I presume that with the screen off the device is using much less power, in fact it will be in power-saving mode, and this means that there is then sufficient power to charge the battery. A quick tap of the power button to switch the screen off at the right moment let the device charge and prevented it from shutting down. Ten minutes later I was able to switch on the screen. It's best to leave the Nexus 7 alone with the screen off when it is charging though.
You'll find other advice on the web, like 'Plug it in and immediately hold down the power and volume down until the boot loader appears. Press the volume down button to select the option to power off the device. Disconnect the charger when it is off and reconnect it. It should then start charging.' Try it if my technique doesn't work.
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