A couple of years ago Fox News did a story regarding an eleven-year-old girl woke up one morning to the smell of something burning. It was her Samsung phone (no mention of which model). It was her battery, and it was a non-OEM battery. Bottom line Samsung replaced her phone with an OEM Samsung battery. Samsung warned owners to replace the batteries with Samsung. I own two Samsung phones, Focus S and S III. I have 5 batteries for the Focus, and the original for the S III. Recently batteryuniversity.com had a piece regarding LI batteries. I buy all my replacement OEM batteries from eBay. I only had one battery give me a problem. A couple of months ago I bought 2 from a seller that would not hold a charge very well. The seller suggested I charge the batteries 12-16 hours for the first 2 or 3 cycles. That helped! When I needed an external charger I bought a UBOC charger. It has adjustable pins. Battery University states that the LI batteries made in the last couple of years can stand the extra time in a charger. During the day I will check the battery that is being charged for any very warm temp. So far no problems. I like the idea regarding an external battery pack, but I have extra batteries for my Focus. Recently I went to a Goodwill store and found 2 brand new Motorola 12V chargers for $2 a piece. I bought one, plugged it in the Focus, and it charged. I went back and bought the other one. I later found out that these were a Motorola fast charger that were $12 or so new. I think my S III is either 3 or 4 years old. It still is doing a good job, but I think it is due for a new one. Please feel free to make comments as I am always looking for better ways to do things. Thanks!