This thread is an excellent venue to show the merits of A123 cells in our hobby....
IMHO, safety is a must!!! After seeing a lot of videos of lipo batteries exploding from being overcharged, I said to myself, WHOA!! This is VERY DANGEROUS!! I won't buy that!!! There has to be an alternative battery for my needs....Here comes the A123 batteries. Well, I don't have to elaborate further on this since almost everyone knows how they perform anyway.
I was one of the first few racers to adopt them in my kits. A XX-4 and an MF2. Granted that you have to be creative in making them fit properly but once you get around doing that, you'll reap the benefits of having the best battery on the planet!!!
Why do I say it is so? The batteries have at least 1,000 cycles! They are as tough as nails. They can be used and abused and they come back for more!
If that is not durable, I don't know what is?