My below question is regarding batteries.
I have a USB charger and a mobile battery (Li-ion battery).
So, my mobile battery percentage has dropped to 0%.
So, what I do now - Take the USB Charger. Plug it in the wall socket and measured the output voltage of the USB Charged. I measured it to be 5V.
But once I connected it to my mobile battery, I measured the voltage in the USB Line and the current through it. (Ignored the D+ and D- lines)
I measured the voltage to be around 4.6V and current to be 0.92A.
My questions :
- When my mobile battery voltage is showing 0%, but the voltage between my mobile battery terminals in 4.6V. I have read that it stops around that voltage because some chemical reactions cannot occur. But My fundamental question is - Even while having 4.6V, why cannot my battery provide current to the mobile and keep it working? Like, the battery has potential difference but is not providing any current? Why is that?
(This is not specific to the only Li-ion batteries. I have seen 12V Lead acid batteries also not providing current even though the voltage across the terminals is around 11V? Why is this happening even though they have the potential difference? Like potential difference should cause current flow right? If potential difference is present, why is the current not flowing from the battery)
- My USB charger was showing 5V before connecting to the mobile battery. But once I connect the charger to the mobile battery, the voltage on the line is showing 4.6V and the current is around 0.92A? The output of the USB charger is supposed to be constant regardless of the load current, right? If not, then it is not a good regulator or charger, right? My question here - Why is the voltage dropping to 4.6V instead of being 5V, when connected to the mobile battery and what determines the current value to be 0.92A?
My USB Battery charger rating is 5V & 1A. So, shouldn't it output 5V & 1A instead of 4.6V and 0.92A?
Please help me to clear my misunderstanding the about two concepts of charging batteries