Thunder power TP8000-3S4P and GMAXX

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Im thinking of getting a pair of these packs.......From the measurements it doesnt look like thes batteries will fit in the chassis.......The packs are 7 1/2" long, when I measured teh lenght between teh Gmaxx battery straps its almost 8" long...... also the height might interfere with the servos....Will these battery fit the Gmaxx?..... Anybody running these packs?

Also, can someone give me a link to a good online store?

Here's link to the packs Im talking about, its the TP8000-3S4P

http://www.espritmodel.com/accesories_batt_thunder.html