Thank you for this explanation! Now this answers my question why those battery shops will buy your busted battery. They can make a "reconditioned battery" by exchanging the dead cells.
I always bring my portable charger and jump-start battery. Unfortunately, I gave my portable battery to my brother. I suppose I can buy a new one.
For a cheapskate like me, I don't want to buy this battery tester if it is possible to check my battery with my multimeter. I don't want to put something that is not OEM, as much as possible, as I consider it as "clutter".
I think I should have bought a clamp meter instead of this multimeter. The only reason I bought this is for our project, we needed to measure the room temperature. I was thinking that a multimeter is a handy tool but I'm thinking now that a clamp meter is better. I can simply turn on the car without starting the engine. In that way, I can monitor the current. The question is, the "correct value" of Ampere reading.
To justify my purchase of this "expensive" five thousand peso multimeter, I hope to get a detailed guide on how to make the one that you mentioned. The ones I found in the internet is too complicated for me or just not OEM for me or I just didn't search thoroughly enough.
