Most Energizer power banks refill in ~3.5–9 hours, depending on capacity and charger speed (5V/1A to USB-C PD 18–20W).
You came here to figure out how long an Energizer pack needs on the wall before it’s ready. Charge time depends on size, input wattage, and the source you plug into. With the right math and a few model clues, you can predict your own number instead of guessing.
Energizer Power Bank Charging Time — What Affects It
Three variables decide your wait: capacity in milliamp hours, the rated input of the power bank, and the output rating of your wall charger or USB port. Bigger capacity stores more energy, but the input limit controls how fast that energy can flow in. A 5V/1A cube feeds at 5 watts; a USB-C Power Delivery input that accepts 9V/2A takes in 18 watts or more. Those figures alone can turn an overnight refill into a short window.
Most recent Energizer models list an input spec for both Micro-USB and USB-C. If your unit supports PD on the USB-C input, use it; it trims hours off a full cycle. Company manuals also note that the time varies by charger type, which is why an old laptop port often feels sluggish. That variability isn’t a fault—it’s physics.
One retail spec even calls out a concrete number: for a 10,000 mAh QE10010PQ with 18W USB-C PD input, the listed full charge time is about 3.55 hours. That’s a helpful anchor you can compare against your own pack and charger.
Quick Math You Can Use
The ballpark formula looks like this: hours ≈ energy in watt-hours ÷ charger input watts ÷ charging efficiency. Typical efficiency across the pack and cable sits near 80–90%. A 10,000 mAh unit stores roughly 37 Wh (10 Ah × 3.7 V). On a 10 W input, 37 ÷ 10 ÷ 0.85 ≈ 4.3 hours. On an 18 W PD input, 37 ÷ 18 ÷ 0.85 ≈ 2.4 hours. Real-world times run longer once tapering near 100% kicks in.
Table: Common Inputs And Estimated Refill Times
| Capacity | Charger/Input | Approx. Time |
|---|---|---|
| 5,000 mAh (~18.5 Wh) | 5V/1A (5 W) | 4–5 hrs |
| 5,000 mAh (~18.5 Wh) | 5V/2A (10 W) | 2–3 hrs |
| 5,000 mAh (~18.5 Wh) | USB-C PD 9V/2A (18 W) | 1.5–2 hrs |
| 10,000 mAh (~37 Wh) | 5V/1A (5 W) | 8–9 hrs |
| 10,000 mAh (~37 Wh) | 5V/2A (10 W) | 4–5 hrs |
| 10,000 mAh (~37 Wh) | USB-C PD 9V/2A (18 W) | 2.5–3.5 hrs |
| 20,000 mAh (~74 Wh) | 5V/1A (5 W) | 16–18 hrs |
| 20,000 mAh (~74 Wh) | 5V/2A (10 W) | 8–10 hrs |
| 20,000 mAh (~74 Wh) | USB-C PD 9V/2A (18 W) | 5–6 hrs |
These ranges reflect typical efficiency and the taper near full. If your unit supports a 20 W or 22.5 W PD input, you can shave a bit more time. Small losses and taper account for differences between estimates seen.
Where To Find Your Model’s Real Input Rating
Flip the pack over and read the fine print near the ports. You should see “Input” lines for Micro-USB and USB-C. Many 10K and 20K models accept 5V/2A by Micro-USB and 5V/2A or 9V/2A via USB-C. The model page or manual repeats the same spec. Energizer’s quick guides also spell out that charging time depends on the power of the adapter you use, which matches real-world experience when swapping between a basic phone cube and a PD charger.
For a concrete reference, the QE10010PQ listing on a major retailer shows a maximum input of 18 W and a full charge time of roughly 3.55 hours. That lines up neatly with the math for a 10K pack on PD. Manuals for the MAX 5K describe the variable time point as well.
Model Examples And What To Expect
10,000 mAh With PD Input
On a modern USB-C PD input rated at 9V/2A, many 10K units land near three hours from low to full with a suitable wall charger. If you plug the same pack into a 5V/2A adapter, expect closer to four to five hours. USB ports on older laptops often deliver less than 1A, which stretches the wait to much longer.
20,000 mAh With PD Input
Double the capacity, and time scales almost linearly until the top-off stage. With an 18 W input and a decent PD wall plug, refills commonly finish in around five to six hours. On a plain 5V/2A adapter, plan on eight to ten hours for a full cycle.
Micro-USB Only Models
Some units stick to Micro-USB inputs rated at 5V/2A. Those charge well enough, but they can’t take advantage of higher-voltage PD modes. If your model lists only 5V/2A in, your best-case time mirrors the 10 W rows in the table above.
Wireless-Capable Models
Wireless charging is handy for phones, but it doesn’t speed up how the power bank itself recharges. The pack still fills through its wired input. Use the USB-C PD input whenever the spec allows it.
How To Cut Your Wait Time
Use The Fastest Supported Input
Match the wall adapter to the bank’s top input rating. If the spec says “USB-C PD in 9V/2A,” use a PD charger that can output 9V. A plain 5V cube can’t trigger that mode. If the device supports 20 W PD in, a PD wall plug with a 9V/2.22A or 12V/1.67A profile will help.
Charge With A High-Quality Cable
Thin or worn cables waste power. A good USB-C cable that supports PD keeps voltage sag low. Keep runs short, and skip flaky adapters that add resistance.
Avoid Shared Ports
Multi-port chargers split power among outputs. If another device is drawing current, your bank may pull less than its rated input. Use a dedicated port while refilling.
Start Above Empty When You Can
Lithium packs slow down near the top end. Topping off during the day trims the time you spend at the slowest part of the curve late at night.
Mind Heat While Charging
Charge on a hard surface with room for airflow. Warm cells can reduce efficiency and push the charging logic to back off the current.
Table: Popular Energizer Lines And Inputs
| Series/Model | Rated Input | Typical Full Charge |
|---|---|---|
| QE10010PQ (10K, PD + Qi) | USB-C PD up to 18–20 W | ~3.5–4 hrs on PD; ~4–5 hrs at 10 W |
| UE20055PQ (20K, PD) | USB-C PD + Micro-USB (PD faster) | ~5–6 hrs on PD; ~8–10 hrs at 10 W |
| MAX 5K (UE5037) | 5V/2A via Micro-USB or USB-C | ~2–3 hrs at 10 W; longer on 5 W ports |
Step-By-Step: Verify Your Own Time
1) Read The Label
Look for “Input” specs printed next to the ports. Note any PD mention and the numbers after it, such as 9V/2A.
2) Check Your Charger
Flip over the wall adapter. Output lines tell you the profiles it supports. A PD charger lists voltages like 5V, 9V, 12V with amperage values. A basic cube might list only 5V/1A or 5V/2A.
3) Do The Math
Convert capacity to watt-hours by multiplying amp-hours by 3.7. Divide by the input watts, then divide by 0.85 to account for losses. Compare the result to the ranges in the first table.
4) Time A Full Cycle
Plug in near low charge and start a timer. Note when the display reads full. Run this test once with your fastest adapter, then keep that charger paired with the bank.
Real Specs You Can Trust
Manuals from the brand spell out the variable-time point based on charger type, and store listings publish concrete numbers for certain models. If your unit is the QE10010PQ, the retail spec notes 3.55 hours to refill when fed at its maximum supported input. Documentation for MAX 5K states plainly that the time depends on the charger’s rating. Those two sources give you both a fixed anchor and a general rule.
See the retailer spec with “Battery Charge Time” and “Maximum Input Power” for QE10010PQ here, and the MAX 5K user manual with the line “Charging time will vary depending on type of charger” here.
If Charging Feels Slow
Test with a different wall adapter, use a short USB-C cable, and try the USB-C input instead of Micro-USB. Unplug other devices from multi-port chargers. Charge on a cool, hard surface. If times remain long, the pack may be aging or the cable may be faulty.
Takeaway: Know Your Input And Do The Math
If you check the label, match a proper wall plug, and use the formula, you can predict charge time within a tight window. A 10K unit on PD lands near the three-to-four-hour mark; a 20K pack on the same input lands near five to six. Drop to a 10 W adapter, and the wait roughly doubles.
If you want one number for a travel day, assume a 10K pack needs around four hours on a solid PD wall plug and double that for a 20K. Bring the fastest charger you own and a short USB-C cable.