Comment by tomcam

FWIW I find these batteries and the charger to be exceptional. You can just leave batteries in and it knows when to stop charging. If you get the big charger and put a bunch of batteries in it charges them round-robin style. And the batteries themselves seem to be sturdy, robust, and high capacity. They're also expensive af so you want to wait for a sale if possible. I even spent a ridiculous amount of money on the battery-powered wet/dry vac and haven't regretted it for a moment.