Sendo M500 battery replacement 3.7-volt mobile telephone
Replacement Sendo M500, M525, M550, M551, M570 battery pack will replace the SOU S681 & 119443 of the Tevion MD6400 & MD7300

Rechargeable cordless mobile telephone batteries, should be charged fully when you receive them and before first use, if not being used then charge every 6-weeks to keep the cells in good order.

Known to fit the following mobile telephones:
Sendo M500, M525, M550, M551, M570 & SOU S681.

TEVION
MD6400 MD7300, 119443.

The physical size of this Sendo M500 battery replacement is as follows:
Length = 53.04mm
Width = 40.03mm
Height = 4.10mm
Battery Type: Li-ion
Battery Voltage: 3.7-volt
Battery Capacity:680mAh