No they aren’t. They have similar wealth to other Caribbean nations, being richer than places like Jamaica and Haiti but poorer than Trinidad or the Dominican Republic. In global terms they rank 83rd, so above average, and they have a relatively high development index, I.e. pretty good health care and education. They might seem poor to you, but they’re actually richer than most of world.
Or get a normal mouse you can use while charging for 15 mins and then have a month of battery. Or charge for 2hrs while using and have six months of battery.