Quote:
Originally Posted by rkomar
I am not an expert on USB, but I learned a bit from the many discussions on this site that took place years ago. USB devices can communicate with each other, passing information on the capabilities of each other before moving data or charging. For safety, the default charging mode is to use a very low current that all devices can handle. The devices can negotiate a higher charging current if they both can handle it and are capable of communicating that to each other. That last bit is what is probably holding your device back when it comes to charging if you are using something that cannot negotiate.
My old 505 would occasionally completely drain its battery. When plugging into USB, the charging would start off really slowly, taking hours before the device could successfully boot up. Once it did, it could negotiate a higher charging current, and filling the battery went much faster. The whole process was more complicated than you might think.
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Thanks for the info.
Does anyone know if there is a way to test the integrity of the battery without buying another battery to swap it out with? They only cost a few quid but would be a shame to waste it if it is perfectly fine and something else is the issue.
Not like AA/AAAs (sorry if you are not in the UK you may not understand that form factor! Just think a common household battery!) where you could just put it in another device as these batteries are very niche.
I know a lot more about general DC electronics now, having done my own electrics for my van build, so wondering if I could cobble something together to test it somehow.