Ive noticed that these VMU batteries die insanely fast (all of mine died in 6 months and I barely used them). And I dont want to buy new batteries since they will cost around $4, especially since a new vmu itself is only $10. Also ive noticed that all it needs is 6 volts of dc power, I was even able to connect 4 AA batteries to power it up. So im wondering if anybody ever made some sort of adapter for them to use an alternate power source?