I don't understand the savings, so it uses half the amount water, but it takes twice as long to take a shower.
I gut and drill the new ones, but only then you find out you're restricted by the flexible hose I.D. for volume.
My best friend had an Audi TT convertible, same issue. BCM is on floor behind seats and got wet from third brake light gasket leaking.
It had to be reprogrammed at Audi dealer.
"CHEAP China knock off batteries may be good for home owner jobs, but for trade and industrial use they are a 110% epic failure. You very soon find you made a bad choice on buying cheap NON-performing batteries."
I concur.
Don't even touch Vanon batteries. You'll get burned for sure. Nothing...