I am guessing you are too young to have collected glass Coke bottles along the road for the 2 cents. That was the same idea as a core charge.
Not sure when I got this old.
That $42 is for scrap.
If you BUT a NEW battery, they will charge you a core charge.
Meaning that $69 battery costs $69 + $10 core charge, plus tax.
Here, I can return an old battery in a short time to get my $10 back (but not the tax on the $10).
Some places must have the 'old' battery when they purchase the new battery, of they just pay the extra $10 plus tax, and can not get the $10 back, meaning they will throw the old battery in a ditch somewhere.
You are buying a small system, and hope the batteries are OK (I'm with ULR- they most probably are not).
You will need a couple batteries, maybe 6V golf cart batts from Sam's Club, meaning scrap batteries are still worth $10.65 each for each new battery you buy.
Then if you do not need 6 new batteries, haul the other/extra scrap batts to the recycler.
I install small new systems, needing batteries, and you can bet my truck stops for every battery in the ditch.
G-