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Z3+ doesn't boot after switching to Ultra Stamina mode and battery drained

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Z3+ doesn't boot after switching to Ultra Stamina mode and battery drained

Hi,

 

Z3+ doesn't boot after:

1) I switched to Ultra Stamina mode (I never used this mode before)

2) after that I fount that battery drained.

3) From that time the phone cannot boot - red led is blinking while charging.

 

Sony Companion doesn't help - nothing happes after connecting device to USB with volume down button (power + volume up tried).

 

Maybe it's worth to change battery - insert charged one. I opened back cover already - I replaced battery to new one a couple monthes before abovementioned accident.

I believe that battery is drained but capable to be charged - but how to charge it directly?

Disconnection of battery contact leads to tripple blinking while charging.

Also I have additional brain new battery.

Now I'm in trip outside USA and there is no Sony service here.

Thanks.