DeWalt DCB206 20V MAX 6.0Ah Battery vs DeWalt DCB2104-2 20V MAX XR 4Ah Battery 2-Pack

Buy the DCB206 single 6.0Ah pack if you want the longest runtime per battery and already own a charger. Buy the DCB2104-2 two-pack if you want two batteries to keep one charging while you work, and the newer tabless cell design. The 6.0Ah pack holds more energy in one battery; the two 4Ah packs together hold more total energy and give you redundancy. Owners of the 6.0Ah praise runtime on grinders and saws but note the weight. The tabless 4Ah packs are newer, run cooler under load and have an overmolded base for drops.

• Choose the DCB206 if you run one high-drain tool hard and want the most runtime from a single battery you swap less often.
• Choose the DCB2104-2 if you want two batteries so one is always charged, plus the newer tabless cells and tougher base.