If I understand you correctly you want to measure how many mAh your batteries get after charging to see if there’s a problem with them.Every decent 18650 charger will have a screen showing how many mAh your battery was charged with.If you don’t have a charger with a screen maybe ask a vaper friend to put them in their mod so you can see the status of the battery.I’m also Greek, so if you have any further questions send me a PM :wink: