Common battery types

 When it comes to picking a portable power bank, you've got different battery types to check out, each with its own pros and cons. Here's the rundown:

1. Lithium-ion Battery (Li-ion): Super popular for portable gadgets. It's got high power, lasts long, and doesn't drain when not in use. But watch out for the cost and safety stuff like overheating.
2.  Nickel Metal Hydride Battery (NiMH): It's cheaper and has decent capacity and lifespan. Not as compact as Li-ion though, and it's a bit heavier.
3.  Lead-Acid Battery (Pb-Acid): It's a budget option with good power and discharge ability, but it's big, heavy, and doesn't last as long.
4.  Nickel Cadmium Battery (NiCd): The old-school choice with high capacity and lifespan, but they're not environmentally friendly and can suffer from memory issues.
5.  Lithium Polymer Battery (Li-polymer): A fancy upgrade to Li-ion with even more power in a sleeker package. But it's pricier and still has safety concerns with overcharging and stuff.

 Just keep in mind what you need it for and pick the one that suits you best!