1) Adjustable current from 0.25A to 3A in ¼ amp increments. It can charge any size battery.
2)Auto Amp feature detects current of all sized packs. You can charge a 50mAh pack right after a 6400mAh pack without making any adjustments.
So it will auto detect and set rate at 50 mA fo a 50 mAh battery but manual selection is limited to 250 mA steps?
Perhaps the 50 is a typo and was suppose to be 500.