The Battery Tender Junior High Efficiency (6V 1.25A) offers much more than a trickle charger could offer. It has a brain. It’s lightweight, compact, and fully automatic; very easy to use, especially in small spaces. It will keep your battery fully charged so that it is ready to go when you are! This unit replaces both the 021-0127 (BT JR 6V, 0.75A) and 021-0144 (BT Plus 6, 1.25A) in all markets.