Interesting, I like the crowbar diode across C41. Will have to expriment with that one. And yes, Q11/12 is pretty critical. Looks like the older one I was sugesting is gone now. I've starting using AOD514's https://www.digikey.com/product-detail/en/alpha-omega-semiconductor-inc/AOD514/785-1357-1-ND/3060919 The nice thing about this MOSFET is that the RDS(on) is lower, and the on resistance is much lower (about 46X!), meaning less heat, lower battery usage, more efficient!