Solar Light Upgrade
I bought one of these solar security lights from Home Bargains and it failed after one night so I took it back for a replacement and the new one did the same thing. Bad batch I thought, so I had to take a look inside. Turned out the lithium-ion battery was duff and holding no charge. It was an AA-sized 3.7 volt battery with no marked capacity so a hunt in the parts bins was called for and this root around turned up a new Nokia 'phone battery in the same 3.7 voltage and 950mAh capacity. A bit of soldering and hot glue wizardry and the light is working as it should.