A123 Racing now has a 6S1P 2300mAh packs for the T-Rex 500 and similar helis. Max amperage is 138A and weight is ~500g. Voltage is slightly lower at 19.8v (3.3v/cell nominal) instead of 22.2v so they will not have the equivalent kick for the same number of cells. So think of them as 5S packs but gear them appropriately for the actual voltage.
Also, you will need an ESC that you can set the low voltage cutoff appropriately (stock T-Rex 500 ESC will not work. Castle Creations and Scorpion are options).
These packs are Li-Ion packs using nanophosphate and are safer and more durable than traditional LiPos and can be quick charged (15-20min) and handle more cycles, but they do weigh a bit more.
You will also need a charger that can charge A123 cells.
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