I use the 4200 nanotech 2s lipo and this fits fine in my losing with savox 1251 low profile and the track star gen 2 speedo you linked above
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-+- Durango DESC210-+- (raced by my 7yo son)
-+-Durango DEX210-+-
-+- Losi 22-+-
-+-Absima CR4T-+-
-+- Futaba 3gr fs -+-
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