I’m sure most of us who play with the likes of Raspberry Pis and other SBC boards as well as other devices, have looked at uninterruptable supplies at one point or another – I often use the little battery powered chargers you get for phones – and until recently I thought that was a universal solution – having powered my Pi in Spain for many months now on one of these and we get awful power cuts there – no problem.
So today I received from BANGGOOD a cheap circuit board that promises to do the job. As it happened my one and only Lithium in a torch left in storage over the winter had kicked the bucket… but I remembered I had a spare but dead battery pack for one of my laptops – and proceeded to open it up. Sure enough half a dozen Lithiums in there.
I took one out that looked clean – dead. Put it on my big power supply for a couple of minutes at 2 amps – it looks ok. So now I’ve attached it to this little board and plugged the board into a decent USB supply. one of the little chips is getting a little hot as it pumps power into the board but I think it will be fine (update once the battery ha some charge this cooled off – then running a FriendlyArm SBC nothing at all got warm). So after it had been on for a while to give the battery a chance to get some power, I plugged an SBC into it’s output. You can see all of this in the picture above. Worked a treat and the little board settled into a blue-flashing-light mode after a few seconds. I repeatedly disconnected the incoming power – no difference, the SBC just kept going.
So if you want something new to play with…. and you’re aware of the dangers of going within 100 miles of Lithium batteries – you might want to give this a shot. At £2.37 inc shipping – you can’t really go wrong provided you give it a damn good test before doing anything serious with it. I think I may make a little bank of them with the remaining Lithium batteries from my power pack.