Freestyle DEKA etx9 battery....Whats your opinion...?

I have heard of them mentioned here and there, what do you guys think that have run them...? I am looking to make some carbon battery boxes and need a good lightweight, reliable model to start with. Thanks.
 

Boris

The Good Old Days
Have been running one for the past few years and never once needed to charge it.
Now all my skis have one and might even stick one into my bike.
 
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