Eastern makes a great point... it's funny--I made a thread on Li-Ions (and their benefits) just about a year ago. I also opened a poll on what battery type people felt were best for sabers.
It's good to see that more people are seeing the advantages of Li-Ion. Not that they are the end-all be-all... but they certainly pack a wild punch with voltage, and regarding energy density... well... you almost cannot beat them when comparing cells of 100% identical dimensions.
I will personally continue to recommend the 18650s Li-Ion cells for many reasons.
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