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I am planning out what electronics I have to get for the Sand Viper, and I'm wanting to know how long the battery cage is so I can narrow that my list of options for batteries. Also, if anyone has any recommendations on LiPos for the Sand Viper, please let me know. Thanks!

Hello all, new to the group and returning to RC after a LONG absence. I just received an older Lunch Box in the mail today and in going over it, it appears the battery box for powering the receiver was removed and it is now powered off the main battery. This still has the old mechanical speed controller. Is there any benefit to getting another box to keep them separate? I know these tend to get removed to save weight. I have had vehicles with and without the extra box and personally found it troubling when the battery was draining that you could lose control of the car since the receiver was getting its power from it. It appears these can still be bought but the only ones I found are Traxxas models, will these work? Lastly, this came with an old AirTronics pistol grip controller. When I put my 3800amh battery in and turned everything on, it went haywire! The servos both went to one extreme end and twitched and moving the trigger or wheel resulted in very little movement or control. The trim adjustments did not help either. Does this sound like the radio or transmitter got damaged in shipment or something else? I wasn't sure if 3800amh is too much for this old receiver either? I don't have a spare radio, receiver, or less powerful battery at this point to check. Thanks in advance