The Redback 40V 5.0A Battery Charger is compatible with any Redback 40V battery (2.0Ah/4.0Ah/6.0Ah). This user-friendly charger has a compact, wall-mountable design and features an electronic status monitor to show precisely when your batteries are at capacity. The LED indicator helps you check the operating status and charging process. Electronic monitoring of the individual battery cells extends the life of your battery. You will find this ultimate Redback battery charger super easy to mount and store. Estimated recharge time: 30 min/2.0Ah battery, 60 min/4.0Ah battery, 90 min/6.0Ah battery. Rest assured, all 40V Redback products are backed by a 3-year warranty (all batteries backed by a 1-year warranty).