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With the Samsung S5, I’d take a couple extra batteries with me when traveling. Never had to worry about a dead battery or bother with a power bank.

That phone was waterproof but had a special ridge around the back panel.

I actually prefer power bank to spare batteries.

Spare batteries can only be used with the phone, whereas power banks are standard and usable with many other devices if needed.

Also, small phone batteries usually don't come with a carrying case. They're fragile and you could accidentally short them.