The DX180 Digital Audio Player uses a 3200mAh 3.8V Li-Polymer battery. It is also compatible with the DX170 player.
The DX260 Digital Audio Player uses a 4400mAh 3.8V Li-Polymer battery. It is also compatible with the DX240 player.
The DX320 Digital Audio Player uses (x2) Li-Polymer batteries: a 3.8V 2000mAh and a 3.8V 4000mAh battery. These are sold as one unit. Also compatible with the DX300 player.
The DX320MAX Ti Flagship Digital Audio Player uses a 6200mAh digital and (x4) 900mAh analog batteries. This is a kit sold as one unit.
The digital section is powered by a single 6200mAh battery pack, while the analog section uses (x4) 900mAh batteries. What got carried over from the DX300MAX is the optimized power supply path for the analog section, the battery pack directly loaded on the amplifier board, and a true ±8.4V battery pack for the amplifier section with no voltage boost.