The bike battery I use is a ytz14s yuasa which is virtually brand new. The old batteries I tried were over volting and not holding a charge, since putting the new battery in no problems with powering BM MK2/TEMPLE MONOS/Bantum/mini t -so far the mono blocks have been by far and away the clear leaders sonically a palpable 3d sound stage and a silence to the system I have never achieved before.
With another lead I will hard wire the DAC/ mono blocks to a new car battery installed in the cellar bellow my listening room.......occasional trickle charge should see it good for a few years.
Croft 7 power amp going up for sale any interested parties PM me please, prior to me placing it in private exhibitions those with post history get first crack.