Li-ion Battery for Apple Watch Series 4 40mm A2058 A2059, For Watch Series 4 40mm

1. The best alternative to primary battery, standby time and call time are equal.
2. Lithium-ion batteries provide excellent continuous power supply for your equipment.
3. Good quality and long service life.
4. Compared with nickel-cadmium batteries, lithium-ion batteries have no memory effect.
5. If you do not use batteries for a long time, please keep them in a cool and dry place and charge them every three months.