MetroPCS LGMS840V Replacement Battery 3.7V 1200mAh 71003 Pressing the power button does

Pressing the power button does nothing because the protection circuit has cut the output rail entirely

this unit is a high-performance battery that delivers consistent output for critical systems

This happens when the fuel gauge IC has not yet recalibrated and the phone hits a voltage cliff under screen or modem load

the SP12-12 offers dependable energy storage to protect sensitive electronics

7V Li-ion Replacement Battery (E4MT131323H12)

MetroPCS LGMS840V Replacement Battery 3.7V 1200mAh 71003 Pressing the power button doesMetroPCS LGMS840V 3. 7V Li ion 1200mAh Replacement Battery This is a 3. 7V Li ion replacement battery rated at 1200mAh (4. 44Wh) for the MetroPCS LG MS840V smartphone. It fits the LGMS840V directly, restoring power to calling, messaging, and app functions. Install it when the original cell no longer holds a charge or the phone shuts down unexpectedly. LGMS840V cell compatibility: The MS840V uses a 3. 7V single cell Li ion pack with a connector and