Siemens M35

The simpler services are, the less likely to break down. Google SRE guidance

Original charger is 45watt. I have also active USB hub that draws 6W while plugged so only 39W goes in SD. But it doesn’t matter as long as AC is connected.

That sound nice on paper but reality is different. I have had two laptops with double (24Wh)batteries (Lenovo T450 and A485) and batteries in both of them degraded fairly quickly compared to other single-battery models.