You want a high-performance portable power station so your phones stay charged and your camp fridge keeps running all weekend. Buy a good one now and you'll only buy it once instead of replacing a cheap one next year.
Timing matters here. Spring outdoor gear sales are the sweet spot because brands dump last year's model to make room for new releases. That older model has the exact same battery life you need, just with a lower price tag.
Remember that the 0% intro window is a hard deadline, not free money. If you still have a balance left when those 18 months are up, regular interest kicks in on whatever you owe.