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Electronics

Power Banks

The box sells you '20000mAh' and '100 hours'. Owners quietly report a pack that swells by month ten and real capacity a third short of the label. We rank power banks on what actually holds up - usable backup, a cool-running cell, and a brand you can reach when it puffs up.

Power bank reviews

How to choose a power bank in India

Two numbers on the box don’t survive contact with a real owner. The first is the capacity - “20000mAh!” - which is the rating of the cells at 3.7 volts, not what reaches your phone. After the step-up to 5 volts and conversion losses, the usable figure is roughly 60-65% of the label, which is why owners across every brand write “feels like a 6000mAh”, “barely two charges”. The second is the headline wattage and the word “fast”: 22.5W, 33W and 35W are real differences, but only if your phone and, crucially, your cable support them - the USB-A-to-C cable bundled in most boxes quietly caps the speed.

What actually decides whether you’re happy in month ten is duller and never advertised: whether the cell stays flat instead of swelling, how hot the bank runs while it recharges, how long it takes to refill itself (four to eight hours is normal and nobody markets it), and whether the brand honours a warranty that is often only six months. Battery swelling within the first year is the defining failure of this category - it shows up in the reviews of the worst picks and as a minority in the best - so we weight cell quality, heat and real after-sales over the printed mAh and the charging-speed marketing. Buy from a listing sold and shipped by Amazon, film the unboxing, and test the bank hard inside the return window, because for several of these brands that window is your real warranty.