Use 16.8V 4s li-ion as 12V supply
Hello, i have 2 items that i want to work together :
A 88.8Wh 4S li-ion nomad battery with a DC barrel output that outputs battery voltage (meaning up to 16.8V/ 16.5 with current SOH)
A DC-DC laptop charger that plugs into a cig-socket and has a dial at the back to boost voltage to either 18, 19, 20… up to 24V for about every laptop on the market (under 72W)
I already have a DC 5.5mm barrel to cig socket adapter, but that means i would feed 16.8V into the charger.
Its sticker says « input : 12V » with no range, but it has worked on my lifepo4 battery which is regularly at 13.2-13.5V and even 14.6 when charging.
Is there a common range 12V devices accept ? Do i have to buck down 16.8 to boost it back up through the charger ? Is there such a device as 16.8-12V barrel/cig socket regulator ?
The goal is more efficiency. The nomad battery has a 220V output that caps at 120W. It’s a square wave. I can charge my laptop with that but the conversion to 220VAC back to 20VDC is probably a lot worse than the DC to DC option.
Edit : based on automod, i might not be in the right sub and i’m sorry. But i don’t feel like other subs are much more relevant