I have 2 problems:
First one, I can not find the polarity of a laptop battery with which it charges. I don't know much about laptop batteries, and the only thing that is written on the label about it is a giant plus and minus on opposing sides, however I found that there are multiple combinations of pins that have the same voltage passing through them (some of which dont even include the opposing pins that have the + and -) when the battery is plugged in to the laptop, which is plugged in to the power brick. The uncertainty comes at whether that + and - is the thing I am looking for.
Second is, I cant seem to find the input voltage of the battery to charge it with. As I said, never worked on batteries before so I am not sure which numbers to follow. I also am afraid of measuring the current through battery connector pins on the motherboard when the charger is plugged in because I dont know what will happen if I reverse the polarity, unlike with volts where I just get a minus in front of the reading, so if anyone can tell me that it'd be great too.
Couldnt find anything about these problems on the internet specific to my battery. It's G91J0 and the laptop is Dell Vostro 15 3515. Some numbers just in case they may help:
- Power brick barrel jack output: 19.5V 3.34A
- Motherboard battery (the supposed + and -) pins without the battery in: 13V
- With battery in: 9.7V
And then there are a bunch of other combinations with different voltages. I dont even know if they publish them but I tried to look for some schematics/diagrams but to no avail. Do I just contact Dell?
PS: Just learning, not trying to do something stupid. Everything is in working order and I am just trying to learn about batteries.