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Hey, I have and HP Envy laptop with an internal flat battery that won't charge. I reached the battery and removed that black cover with aluminum sheet. Now i can see 4 Pouches (flat lithium batteries) i tested the voltages of these batteries and found that all of them have a voltage near 3.7V...

I live in the MEA region and i am using imported faulty power banks. the downside of these batteries that they loose capacity so fast at higher loads. i think it's very useful to make a thread dedicated for 18650 battery sourcing where everyone -from different countries- can share his...

from where to get the best18650 batteries in terms of quality and price. Old laptop batteries, Ebikes, powerbanks, powertools, or maybe another sourcelet me know what do you think.