Might give Steven Maney a ping - before he quits responding. Might add a smallish stereo subwoofer capacitor or factory Blue Can, to fill in Li lack of power spike delivery - until it warms up to the task. I've pow wowed with Li battery vendors for stereo use to be told not workable as can't sustain the needed draw like antique lead chemistry can. Could get bigger Li or put two in, if room enough.