If the terminals of the battery pack are dirty or corroded, it may not have a proper connection and will not charge. Device will not start up The battery does not have enough charge to power the device: Press and hold the charge indicator button on the battery pack.
Excess charging voltage leads to plating of metallic Lithium. Damage. This can lead to thermal runaway (vigorous fire) Your link to Battery University explains why the charging voltage should not exceed 4.20 V / cell
For example, undercharging a Li-Ion battery by only 100 mV (-2.4% for a 4.2-V Li-Ion cell) results in about a 10% loss in capacity. Since the room for error is so small, high accuracy is required of the charging-control circuitry. The problem is that on lower voltages, the battery will not be fully charged.
Prolonged charging above 4.30V forms plating of metallic lithium on the anode, while the cathode material becomes an oxidizing agent, loses stability and produces carbon dioxide (CO2).
Your link to Battery University explains why the charging voltage should not exceed 4.20 V / cell Lithium-ion operates safely within the designated operating voltages; however, the battery becomes unstable if inadvertently charged to a higher than specified voltage.
The main challenge in charging a Li-Ion battery is to realize the battery's full capacity without overcharging it, which could result in catastrophic failure. There is little room for error, only ±1%. Overcharging by more than +1% could result in battery failure, but undercharging by more than 1% results in reduced capacity.
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