The real star of the show here is the
firestarterlithium ion battery pack.
Looks like we’ve got a “Shilly-car” lithium battery operating at 36 V with 4.4 Ah (that works out to 158 Wh—just over four times the capacity of an iPad Pro).
Inside, we find a tidy block of 20 LG ICR18650B4 batteries with their own protection board. We’re glad to see a reputable brand in here!
Their nominal voltage is much higher than the 158 Wh listed on the shrinkwrap. Li-ion batteries shouldn't be fully discharged, so the battery protection board probably limits the pack to the label's specs.