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Yes, certainly. Because built-in FET diodes is already ready rectifier, and for implementing a charger is remains to switch off bridge and add triac for regulation, at first sight. But may be later. Next winter )can be enhanced with implementing a charger using the same transformer
I take transformer from UPS with quasi sine wave output with 1/30 turns ratio, as i see on oscilloscope.what turns ratio are you using mean 8/280 8/315 or 12/220.
It is easy to make from two twisted wires or strips or as we may see in cheap multimeters - from thick bitten wire.with current sensing on the high side as finding suitable shunts here is difficult
it depends from display native brightness and may be from 330R to 1k.what r u showing on it