I also bought watch batteries at a great deal on Ebay.
Trouble is China has basically no rules and they don't care about anyone.

I quickly realised my batteries would "sweat" a liquid out of them into my watches. Touching the batteries also created a reaction on my skin.

Needless to say I quickly threw all of them out.
They could use illegal unsafe substances and don't give a crap.

Please do not buy anymore Chinese batteries.