Originally Posted by
srkmagnus If you are purchasing a battery that is not in original packaging then considering staying away. If you must purchase it then place it on a flat surface, such as a table. Give it a quick spin and if it rotates for a few seconds it's likely a bad battery showing signs of "swelling". The battery should not spin like a top if its in good condition.
Also, consider sticking with a reputable company or reseller so you at least have a warranty on the battery if you must return it for any reason.
I didn't even think of spinning a battery. Nice tip even though I always buy new from reputable sellers.
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