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I bought a Novak Spy Li-Ion battery to use in my DTM X4 BUT found that it was too heavy and bulky. It didn't fit right in my X4 b/c of the drive shaft that runs right down the middle.
A guy at my LHS pointed me in the direction of other Li-Ion batteries that many people use for their "slow-flyer" airplanes. I bought of these small battery packs (7.4v, 700 mah) and it runs GREAT (and FOREVER) in my X4. To charge this battery, I use the charger that came with the Novak Spy Li-Ion battery and have no problems.
I honestly don't know about the "punch" of Li-Ions v. NiCads or NiMH's but Li-Ions seem to be rated with more voltage than NiCAD or NiMH.
With this battery, and a Team Orion Elite Modified motor, my X4 SCREAMS!
I'm not too sure of the layout of the DTM SP, but because it doesn't have the 4WD shaft down the middle of the car that my X4 has, perhaps the Novak Spy Li-Ion will work in your SP.
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