This trick requires a Life Tank, but it does not have to be full. Spend all your Metals until you have less than 50. After that, buy the Life Charge Chip. Normally you cannot buy it if you do not have more than 50 Metals. If it works, you will see the Metal counter get crazy. You can now buy anything at the R&D Lab. If you take any Metal on a stage, the metal counter will drop to the top (9999999).