In Blue Smart IP67 battery charger datahseet it is stated that it can be used as a power supply. Is there any mode select buton on the device to use it as a power supply?
No it just does it. When you plug it in you see the adjusted voltage on the clamps. Regardless whether you have a battery connected or not it can power whatever at that voltage up to the rated amps. If a battery is connected it realizes it by the eventual drop in current and it switches through the stages
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