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 DX340 DAP uses (x2) Li-Polymer batteries: a 3.8V 2000mAh and a 3.8V 4000mAh battery. These are sold as one unit.
*NOTE: while compatible, the batteries in the DX300 and DX320 are not easily replaceable and require more advanced methods.
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.
This battery may be the same voltages, but it is designed differently than the original battery. The digital wire is on a different side of the battery, and the mounting tape is on the digital battery side instead of the analogue side like the original. And the battery is slightly thicker than the original. Because of this, it won't fit properly. It will fit if you jam it in the compartment, but the back cover will bulge and not close cleanly like it did before. The new battery will not sit in the battery tray on the inside of the back cover the way it was designed to be placed. Bottom line is the original and replacement batteries are different from each other. For whatever reason this decision was made, it negatively impacts the player. The player will work with the new battery, but it is still the wrong battery for this player.
Always good to have a spare battery ready to go!