V20 battery won't charge over 94% what do I do?

[sswitzer]

Try out AccuBattery ... Lots of good info about charging and your battery health.

 

[Rukbat]

Okay, late to the party, but ...

1. If you regularly drain the battery to zero, or to when the phone shuts off, a week is all it takes to permanently ruin a lithium battery. They're NOT deep-discharge devices. (They are the lightest metal there is, which is the only reason they're being used. If we could use solid hydrogen as a battery electrode, that would be the best choice - but a lead-acid battery can take years of abuse and keep working. You just don't want to lug 5 pounds of battery around to power a phone.)

2. Recalibrating the battery means charging it until the terminal voltage stops going up, then setting the calibration file to "100%" - which it is when the terminal voltage stops rising during charging. That can only be done with a rooted phone. (Battery Calibration (Root) makes it easy.)

 

[Mooncatt]

Okay, late to the party, but ...

1. If you regularly drain the battery to zero, or to when the phone shuts off, a week is all it takes to permanently ruin a lithium battery. They're NOT deep-discharge devices. (They are the lightest metal there is, which is the only reason they're being used. If we could use solid hydrogen as a battery electrode, that would be the best choice - but a lead-acid battery can take years of abuse and keep working. You just don't want to lug 5 pounds of battery around to power a phone.)

A lead acid starter battery can be ruined by deep discharges just like a Li-ion battery. Deep discharge (aka "marine") lead acid batteries are what you would need for that type of service.

 

[darkmage619]

I had the same issue. I just restarted the phone and it charged to 100%. I hadn't restarted in several weeks. Maybe the calibration fails after an extended run time.