A solid portable power station keeps your gear running off-grid and keeps the lights on when the storm knocks out power. You want something that holds a charge well and lasts for years, so you buy it once instead of replacing a cheap one down the road.
Tech brands usually drop new models in the spring, which means November is the sweet spot for deals. Last year's model often drops in price right when the holiday sales start, and it usually has almost all the same features.
That 0% window is a deadline, not free money. If you still have a balance left when the 18 months are up, interest kicks in on what is left over.