Power Bank Ka mAh Scam: Numbers Bade, Performance Kam

Aapne kabhi notice kiya hai? Power bank ke box pe likha hota hai 20,000 mAh, lekin phone sirf 3–4 baar hi charge hota hai. First thought aata hai: “Mera power bank kharab hai.”

Truth? Power bank kharab nahi hota — aapko mAh ke naam pe confuse kiya jaata hai.

Let’s break this scam properly.

mAh Samajhne Ka Sabse Bada Confusion

mAh (milliamp-hour) sirf capacity number hai, poori story nahi.

Power banks apni capacity calculate karte hain internal battery voltage (around 3.7V) par.

But your phone charge hota hai 5V ya usse zyada pe (fast charging me 9V, 12V bhi).

Yahi gap poora game bigaad deta hai.

Real Math (Jo Brands Nahi Batate)

Maan lo:

•Power bank: 20,000 mAh @ 3.7V

•Total energy ≈ 74 Wh (Watt-hours)

Phone battery:

•4,500 mAh @ ~3.8V

•Energy ≈ 17 Wh

Ideal world me: 74 ÷ 17 ≈ 4.3 charges

Real world me:

•Voltage conversion loss

•Heat loss

•Circuit protection loss

•Cable inefficiency

Result? 20–30% energy gone.

Final output: 3–3.5 full charges, not 5.

So jab aap sochte ho “company ne jhoot bola,” technically unhone sirf half truth bola.

Companies mAh Hi Kyun Dikhati Hain?

Simple reason:

Bade numbers bechte hain.

•“20,000 mAh” looks better than “74 Wh”

•Most buyers voltage ya watt-hours nahi samajhte

•Legal loophole hai, fraud nahi

Marketing smart hai. Consumer informed nahi.

Performance Kam Kyun Lagti Hai?

Because performance sirf capacity se nahi aati.

Important factors jo log ignore kar dete hain:

•Output wattage (18W, 30W, 65W)

•Charging protocol (PD, QC)

•Battery cell quality

•Efficiency rating

A cheap 20,000 mAh power bank can perform worse than a high-quality 10,000 mAh one.

Smart Buyer Kaise Banein?

Next time power bank kharidte waqt:

•Sirf mAh mat dekho

•Watt-hours (Wh) check karo

•USB-C PD support zaroori hai

•Apne device ke watt requirement samjho

Bigger number ≠ better performance. Physics doesn’t care about marketing.

FAQs

1. Kya mAh fake hota hai?

Nahi, mAh fake nahi hota. Context ke bina dikhaya jaata hai.

2. Watt-hour (Wh) zyada important kyun hai?

Wh actual energy batata hai, jo real performance decide karti hai.

3. 20,000 mAh power bank phone kitni baar charge karega?

Usually 3–3.5 times, phone battery size par depend karta hai.

4. Fast charging power bank me kya dekhna chahiye?

Output wattage aur protocol (PD/QC), sirf “fast” label nahi.

5. Best capacity kaunsi hoti hai daily use ke liye?

10,000–15,000 mAh with good efficiency is enough for most users.