I'm not an electrical engineer by any means. I now have an array of USB chargers for various devices and am wondering if I can consolidate.
No 1 is a plug that takes a USB lead, labelled as 5VDC, 750ma
No 2 is also a plug that takes a USB lead, labelled as 5V, 1.8a
No 3 is a plug with a lead built in and a red/green light to indicate charging status. It's labelled 5.2V, 580ma
From my meagre knowledge, I can swap 1 and 2, but 1 will take longer to charge a given device. Is that right? How does 3 fit into this equation? Will it blow things up?
FWIW, 1 comes from a charger for 18650 batteries for my torch, 2 from my new tablet, 3 was left at work and I use it to charge a smartphone that someone gave me without a charger as the USB port on the phone seems dodgy and the light tells me when I've got the connection right and it's actually drawing power