So far so good, the car sat for three days, no issues. On my E46 M3 SMG, at times my braille battery would die if the car sat for only 1 day.
08 E92 M3 DCT - Bolt Ons - 60-130MPH 10.71s - 11.88 @ 118MPH - 377WHP
ESS VT2-625 SC 60-130MPH 6.80s - 11.30 @ 129.3 MPH 586WHP / 379WTQ
ESS VT3-750 - 60-130MPH 6.44s - 10.81 @ 135.13 MPH 690Whp/463Wtq