Tyfy DU-21 Li-ion Camcorder Battery Replaces PANASONIC DU-21 Camera Battery.Tyfy Batteries are the most reliable, efficient and Long Lasting solution for the professional Camera/Camcorder. Tyfy Batteries gives highest back up and more recycle than the other brand batteries. The battery needs to be stored in the dry and cold place. The recommended storage temperature is 10-30 DegreeC. Model: for PANASONIC DU-21. Voltage: 7.4V. Capacity: 2000mAh. Cell type: Li-ion. Fit For Panasonic: AK-GS10/11/30/40/50/55/70/50S/400/VDR-M30,NV-GS10/30/4050/70,PV-GS50/50S/70/M30.