You must be doing something wrong, I just pulled the batteries out of an old laptop battery pack that is 20 + years old and managed to get 5 out of 6 18650 batteries out of it to recharge and are holding charge nicely 4.14 volts after a 3 weeks from charging.
You must be doing something wrong, I just pulled the batteries out of an old laptop battery pack that is 20 + years old and managed to get 5 out of 6 18650 batteries out of it to recharge and are holding charge nicely 4.14 volts after a 3 weeks from charging.