How Many Times Does 20000mAh Charge a Lenovo Yoga Tab 11?
Updated 2026-08-18 · Power Bank Guide
When you ask, "20000mAh charge Lenovo Yoga Tab 11?" the answer depends on the battery’s capacity, conversion efficiency, and the tablet’s own power draw. A 20 000 mAh pack stores roughly 74 Wh (20 000 mAh ÷ 1 000 × 3.7 V). The Yoga Tab 11’s 7700 mAh (28.3 Wh) battery means, in theory, you could get about 2.6 full charges. In practice, because USB‑C PD conversion is only about 60‑70 % efficient, you’ll see around 1.8–2.0 charges per full charge of the power bank.
Understanding the Numbers: mAh vs. Wh
Power banks are rated in milliamp‑hours (mAh) at a nominal 3.7 V cell voltage. To compare them with device batteries, convert to watt‑hours:
- Power bank: 20 000 mAh × 3.7 V ÷ 1 000 = 74 Wh
- Lenovo Yoga Tab 11: 7 700 mAh × 3.7 V ÷ 1 000 ≈ 28.5 Wh
Divide the bank’s Wh by the tablet’s Wh to get a theoretical charge count (74 ÷ 28.5 ≈ 2.6). Multiply by an efficiency factor of 0.65 (average for USB‑C PD) to reach a realistic 1.7‑2.0 charges.
How Many Real‑World Charges Can You Expect?
Below is a quick reference for common devices when paired with a 20 000 mAh (74 Wh) bank delivering 22.5 W USB‑C Power Delivery:
- Lenovo Yoga Tab 11: 1.8–2.0 full charges.
- iPad Pro 12.9" (10 000 mAh, 37 Wh): 1.5–1.7 charges.
- Microsoft Surface Go (27 Wh): 1.6–1.8 charges.
- Nintendo Switch (16 Wh, docked): 3–4 charges.
- Steam Deck (40 Wh): 1.5–1.8 charges.
- Smartphones (3–4 Wh): 15–20 charges.
These figures assume the power bank is fully charged, the device is turned off or in low‑power mode while charging, and the USB‑C cable is of good quality.
Why USB‑C PD Wattage Matters
The INIU 20000 mAh Portable Charger (Flight‑Safe) delivers up to 22.5 W via USB‑C Power Delivery. That’s enough to charge most tablets and thin‑and‑light laptops, but not high‑performance laptops that require 45 W or more. Here’s what 22.5 W can handle:
- Tablets: Full-speed charging (typically 12‑15 W needed).
- Laptops under 15 W: e.g., Chromebook, entry‑level Windows‑on‑ARM, or the Yoga Tab 11 when using USB‑C PD.
- Gaming handhelds: Switch in handheld mode (up to 18 W) will charge, but the Steam Deck will charge slowly because it draws more than 22.5 W when active.
- Earbuds, cameras, smartwatches: Very quick top‑ups, often under a minute.
If a device requests more power than the bank can supply, it will simply draw the maximum available (22.5 W) and charge more slowly, or it may refuse to charge if the voltage/current negotiation fails.
Flight‑Safe Capacity: TSA/FAA Limits
The Federal Aviation Administration caps carry‑on lithium‑ion packs at 100 Wh. A 20 000 mAh bank at 3.7 V sits comfortably at 74 Wh, well under the limit, making it a safe choice for air travel. Always double‑check with your airline before boarding, as policies can vary.
Choosing the Right Power Bank for Your Yoga Tab 11
If you need a reliable, travel‑friendly option, the INIU 20000 mAh Portable Charger (Flight‑Safe) checks all the boxes. It provides 22.5 W USB‑C PD, includes a high‑quality USB‑C cable, and even adds a flashlight for emergencies. Its pocket‑size form factor means you can keep it in a laptop sleeve or backpack without adding bulk, and the efficiency of its internal circuitry (≈65 %) aligns with the realistic charge count discussed above.
For users who frequently run power‑hungry laptops or the Steam Deck, consider a larger‑capacity bank (30 000 mAh or more) with 45 W or 60 W PD output. But for the Yoga Tab 11 and similar tablets, a 20 000 mAh model like the INIU is more than sufficient.
FAQ
How do I calculate the real‑world capacity of my power bank?
Take the rated Wh (mAh × 3.7 V ÷ 1 000) and multiply by the conversion efficiency, typically 60‑70 %. For a 74 Wh bank, the usable energy is about 44‑52 Wh.
Can the INIU 20000 mAh charger power a laptop that needs 45 W?
No. Its maximum PD output is 22.5 W, so a 45 W laptop will either charge very slowly or not at all. You’d need a bank that supports at least 45 W PD.
Is it safe to use the power bank while flying?
Yes, as long as the total Wh is under 100 Wh. The INIU 20000 mAh model is 74 Wh, which meets the FAA’s carry‑on limit. Always verify with your airline before travel.