Its 18.4 kWh lithium iron phosphate battery pack delivers an all-electric range of 80 km (50 mi).

[7][17] The Tang DM received a facelift for the 2021 model year alongside the introduction of the DM-i hybrid powertrain.

The BYD DM-i powertrain is constructed with a 1.5-litre turbocharged engine powered plug-in hybrid system.

In order to achieve high thermal efficiency, BYD designed the engine with compression ratio (CR) of 15.5, an increased B/S (Bore to Stroke) ratio, an Atkinson cycle for improved combustion efficiency, an exhaust gas recirculation (EGR) system, and a series of friction-reducing measures.

The DM-p was also introduced as a more performance oriented DM variant featuring the 1.5-litre turbo engine hybrid system.

The 0–100 km/h acceleration for the DM-p variant is under 4.3 seconds while maintaining the 215 km (134 mi) pure electric range.