False indication of the total cost! If you switch off the column for five minutes after hearing that 20% of the charge has been made, the percentage will have increased to 30% when you turn it back on (the charge is also stored on the phone through the widget) The continual warning that there is little charge left begins around 20%, which can sound as many as six or eight times (I didn't count) before shutting down and being reduced by 10% in power. You can't predict how long it will last because it could suddenly shut off.
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