opinion - costco gr 78 batts & parallax 7300 charge data

i think the walmart tender is schumacher. they also have a battery tester for $35, but i am not sure how to use it, especially w/ the 'entanglement' posed by the BIRD.

i guess i would put the tender on either battery, 'cuz they will both start charging and somehow share the 1.5 amp trickle.

what intrigued me was how i stumbled onto this

burlmart wrote:

with house batt ground terminal off, crank engine, turn house toggle to ON, and engine lights up house things.

this seems to say you do not need a house battery at all.