Can I damage Li-ion battaries(https://www.amazon.com/EBL-Battery-Charger-Rechargeable-Batteries/dp/B00HV4KFSA/ref=sr_1_1?ie=UTF8&qid=1522871789&sr=8-1&keywords=EBL+840+9V+Li-ion+Ni-MH+Battery+Charger+with+600mAh) if I use them for "on-table" testing? I would like to re-use the batteries I have for first tests.
Will the speed of battery drain "kill" those batteries.
What is the good option for small tests? should I use specific power adapter?