Get a good charger
I ordered this 16 pack (actually comes as 4 packs of 4) and luckily I have a high quality charger that tells me if the batteries are charged and to what level.  4 of the 16 batteries I ordered won't charge (after 15 minutes of use).  I hope the seller will work with me on this.  I will be trying a different brand next time.
Rating: 3 stars