Search for a power bank under Rs 1,500 in India and you will get a wall of listings all claiming 20,000mAh. Capacity is the easiest number to print and the least useful one on its own. Here is what actually separates a good budget power bank from a bad one.
1. Output wattage matters more than capacity
A 20,000mAh power bank that outputs 10W will charge your phone slowly no matter how much charge it holds. Look for 22.5W output, which is the practical sweet spot in this price band and enough to fast-charge most Android phones and to charge an iPhone at full speed over USB-C PD.
Both the PowerVolt 102 Max (20,000mAh) and the PowerVolt 101 Blade (10,000mAh) run 22.5W, which is why they charge noticeably faster than cheaper units of the same capacity.
2. You never get the full advertised capacity
This surprises people, but it is physics rather than marketing dishonesty. A power bank's cells store energy at 3.7V; your phone charges at 5V. Converting between them loses energy as heat. Expect around 60-70% of the rated capacity to actually reach your phone.
So a 10,000mAh power bank delivers roughly 6,000-7,000mAh of usable charge. On a phone with a 5,000mAh battery, that is about one and a bit full charges, not two. A 20,000mAh unit gets you to roughly two and a half. Any listing promising exactly four full charges from 20,000mAh is quietly ignoring conversion loss.
3. Check the input, not just the output
Plenty of budget power banks charge your phone quickly but take six hours to refill themselves, because the input is limited to 5W. If you charge your power bank overnight this may not matter. If you top it up between meetings, it matters a great deal. Look for fast input over USB-C, and ideally bi-directional Type-C, which means the same port both charges the bank and charges your phone.
4. A battery display is worth more than it sounds
Four LED dots tell you roughly how much charge is left, in 25% steps. A digital percentage display tells you exactly. The difference shows up when you are deciding whether to charge before leaving the house.
5. Ports, and what you actually carry
If you carry a phone and earbuds, you want at least two outputs. If you hate carrying cables, a power bank with a built-in Type-C cable like the PowerVolt 201 Link removes one thing from your bag. If you use a recent iPhone, a MagSafe power bank that snaps to the back is genuinely more convenient than a cable, though wireless charging is always slower and warmer than wired.
6. Weight is a real specification
A 20,000mAh power bank weighs roughly twice what a 10,000mAh one does. People routinely buy the bigger capacity and then stop carrying it. If it lives in your bag every day, 10,000mAh is usually the better buy. Save 20,000mAh for travel, long shoots, or trips where you are charging more than one device.
What we would buy
For daily carry: a 10,000mAh at 22.5W. For travel or heavy use: 20,000mAh, accepting the weight. For an iPhone user who wants convenience over speed: MagSafe.
You can compare the full range on the Salpido power bank collection. Every model ships free across India with a 1-year warranty and a GST invoice.