Back in 2006 I bought this
Blackburn Quadrant & Blackburn Mars 3.0 combo for like $35 and I JUST replaced it in 2019 with a Cygolite Metro 700 and Cygolite Hotshot 100 combo.
The Blackburn headlight took 4 AA and the taillight took 2 AAA and I replaced them like once or twice a year at most. The Cygolites have to be charged like every 3-4 days; they will probably go a few more hours but they start to get dim around 6-8 hours of use. I pretty much use flashing modes day or night. Well I don't really ride at night apart from daybreak and a little after sunset. IK don't need the headlight to provide light to see, just to be seen.
My opinion is that USB rechargeable sucks. It's nice that the Cygolite headlight is a lot smaller and definitely brighter, but the taillight is the same size.