THE BABYSITTER
A redhead ain't a blonde
And a battery charger is not a converter
So son't call a charger -quarterhorse- a plow -mule- which is a good moniker for most converters out there. A plow mule will keep going when the quarter horse is back in the barn. Trouble is some folks think a mule can plow a field by itself. That's just as ridiculous as believing a quarterhorse being faster can plow a field faster.
If a battery isn't recharged it will die out. And all the magic eight ball fortune teller toys and Ouija boards in the world aren't going to help. They attempt to guess at what's right for the battery.
How does an integrated circuit know for a fact all cells are bubbling slightly and then switch to float voltage?
"AHA! It took 68 minutes this time so that means it'll take the same amount of time next time" ain't in the program with an IC chip.
It's a lot like the formula E=I/R
"Our handy dandy gizmo don't need no steenking "R" It's patented circuit assumes what R should be.