RC LOVER

My 2012 project, Recondition a broken RC Big Foot scale 1/12. It free found in a junk shop with  1. Broken wheel hub 2. Broken linkage 3. No body 4. Missing one tyre 5. Rusty all screw. 6. Circuit board still function 7. Rear wheel drive.  Maykasing Made in China. 2 years back i buy this units from Internet for rm120, after testing i don't like it because all 4 tyre is a hard plastic i sole it. But know i got it free in bad Condition will rework back. The New Modification i done for this big Foot is, i can use 2 type battery Nimh 7.2V 18 00mAh or the original 9.6V 900 mAh N icd . Using 7.2V battery i add additional wire o ut from the Circuit board.and the battery i put on top of the Circuit casing. The disadvantage is this battery is heavy , the big foot a litter bit slow but running time is longer. If use original 9.6V battery it run fast but ru nning time short  ( Warning DO NOT PUT BOTH BATTERY TOG ETHER , THE HIGH CURRENT 16 .8V WILL B U RN THE CIRCUIT BOARD) On 31/