I have a 66 M20E. After my last upgrades we did a weight and balance. I was surprised with the outcome. We removed 35lb of gauges,wire, and instruments. We also installed a plane power alternator conversion. The aircraft already had a new style starter. We installed an EI.MVP50 a Garmin aera560. We removed the 2nd vor radio,ADF, loran and DME. When she was new she waighed in at 1633 with cg of 45.7 empty. Now with all this light weight new gear she weighs in at 1671.4 with cg of 48.02. She was painted once in the 80s has led a pamperd life of heated hangers from previous owner of 25 years. I can live with the new empty weight but I can see new limits on my useful load as I will go out the back of the envelope before reaching gross weight . So here is my question. Is it possible to relocate the battery from behind the rear seat to in front of the firewall? We're there Moonies built this way from the factory? I think I have removed so much weight up front and very little aft. Thanks in advance for all your input. I enjoy this forum very much.