accord00
Member
I just found these on amazon. Seem pretty cheap, and have good power. One site said max charge current is 30 amps. Wonder how well they'd work for extra batteries.
https://www.amazon.com/dp/B00ISDL05K/ref=cm_sw_r_awd_s4w4ub0BK4SY5
https://www.amazon.com/dp/B00ISDL05K/ref=cm_sw_r_awd_s4w4ub0BK4SY5