I felt a great disturbance in the Force, as if thousands of physics teachers suddenly cringed and started yelling "Get your units right!".
Wh is a unit of energy (1 Wh = 3.6 kJ) and by nature cumulative. And cumulative units can't peak, so Whp [sic] is impossible as a unit. What you really meant is Wp, as W is a unit of power (1 W = 1 J/s), which is a momentary value and momentary values can peak.
Not half as bad is potted in RTC batteries. As in: The RTC chip and battery are inside the same epoxy-filled package.
The bane of vintage SUN hardware (and some PC clone manufacturers in the 386-486 era) collectors.
Two words: future proofing. In many places, 2G and 3G networks are either turned off already, or will shutdown in a year or two. Especially with the dumb phone target audience, a phone that will become a brick in a couple of years, is most definitely not something they're looking for.
Solar panels lasting for decades here and now, that's close enough for all practical purposes.
Solar has a proven track record, hydrogen technologies never made it past gospel.
1976
Also my birth year.