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Duracell M250 Runtime Calculator
Quick answer: the Duracell M250 stores 219 Wh and delivers up to 100 W of continuous AC power. Under this site's planning assumptions (85% inverter efficiency, 10% reserve), a steady 100 W AC load runs for roughly 1.7 hours. Last source check: 2026-08-21. This is an estimate, not a guarantee.
Battery capacity219 Wh
AC output100 W
Surge output100 W (continuous AC ceiling proxy)
Battery chemistryLi-ion NMC
ConfidenceVerified
Source regionGlobal/general sources
checked2026-08-21
Swipe table sideways
| Battery capacity | 219 Wh |
|---|---|
| Battery chemistry | Li-ion NMC |
| AC output | 100 W |
| Surge output | 100 W (continuous AC ceiling proxy) |
| DC output | not available |
| USB-C output | 100 W |
| Solar input | 36 W |
| Weight | 2.05 kg |
| Confidence | Verified |
| Lifecycle status | Unknown |
| Source region | Global/general sources |
| Last verified | 2026-08-21 |
Catalog notes (original English)
No 12V car/barrel output is listed; the manual's DC total covers USB-C, USB-A, wireless charging, and lighting paths. Duracell does not publish a separate AC surge figure, so surge stores the continuous 100W AC ceiling. The 36W solar value is the official M-Solar accessory's maximum PD output, not the M250's 100W USB-C input ceiling.
Runtime estimate
Formula starting points use each scenario’s default watts, duty cycle and output path, with 10% reserve or 15% for CPAP. Linked detail pages use the same inputs. Hours apply only if the device can run and start; they are not measured runtimes.
Swipe table sideways
| Device scenario | Planning default | Estimated runtime | Device scenario: Confidence | Models |
|---|---|---|---|---|
| Full-size refrigerator | 500 W · 33% · AC inverter · Reserve: 10% | 1h 1m Exceeds a tracked power limit — do not rely on these hours | Estimated | Calculator |
| CPAP without heated humidifier | 40 W · 100% · AC inverter · Reserve: 15% | 3h 57m Within the tracked power limits; compatibility still needs checking | Estimated | Calculator |
| Starlink Mini | 32 W · 100% · USB-C PD · Reserve: 10% | 5h 40m Within the tracked power limits; compatibility still needs checking | Estimated | Calculator |
| Wi-Fi router | 12 W · 100% · AC inverter · Reserve: 10% | 14h 27m Within the tracked power limits; compatibility still needs checking | Estimated | Calculator |
| LED TV | 100 W · 100% · AC inverter · Reserve: 10% | 1h 41m Within the tracked power limits; compatibility still needs checking | Estimated | Calculator |
Runtime calculator
Runtime is conditional on successful startup, compatible voltage/connectors and sufficient output. Verify the actual device setup before relying on these hours.
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Power station model
Battery capacity (Wh): 219 WhContinuous output rating (W): 100 WSurge output rating (W): n/a
Estimated runtime2h 48m1h 45m – 3h 28mEstimated runtime: 2h 48m, 1h 45m – 3h 28m
Output path
Estimated runtime
Within the tracked power limits; compatibility still needs checking
This is an estimate. Real runtime changes with load, temperature, battery age, AC/DC output, and device behavior. Runtime is conditional on successful startup, compatible voltage/connectors and sufficient output. Verify the actual device setup before relying on these hours.
2h 48mEstimated runtime: 2h 48mThis setup is tight. Reduce load, use DC where possible, or choose a larger station.
Conservative1h 45m
Estimated2h 48m
Optimistic3h 28m
These are calculated sensitivity cases, not a statistical confidence interval. Conservative uses lower efficiency and battery health, more reserve/temperature loss and higher load; optimistic changes these assumptions in the opposite direction.
- This is an estimate. Real runtime changes with load, temperature, battery age, AC/DC output, and device behavior. Runtime is conditional on successful startup, compatible voltage/connectors and sufficient output. Verify the actual device setup before relying on these hours.
- Within the tracked power limits; compatibility still needs checking
Show your work
Rated Wh is reduced by efficiency, reserve, battery health, and temperature before it is divided by average load.
- Rated battery
- 219 Wh
- Usable energy
- 168 Wh
- 219 Wh x 85% x 90% x 100% x 100%
- Running watts
- 60 W
- Average load
- 60 W
- Max surge
- n/a
- Fixed station overhead
- Unknown (not included)
- 60 W / 85% = 70.6 W battery draw; fixed overhead is unknown and excluded
- Estimated runtime
- 2h 48m
- 168 Wh / 60 W = 2h 48m
- Output path
- AC inverter
- Efficiency (%)
- 85
- Reserve kept unused (%)
- 10
- Battery health (%)
- 100
- Cold weather loss (%)
- 0
This link contains the numeric values you entered, but not custom load names.
Source-Backed Next Steps
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WattRunTime.com
WattRunTime estimate
Estimated runtime
2h 48mThis setup is tight. Reduce load, use DC where possible, or choose a larger station.Usable energy168 Wh
Average load60 W
Fixed station overheadUnknown (not included)
Running watts60 W
Max surgen/a
Runtime range
Conservative1h 45m
Estimated2h 48m
Optimistic3h 28m
Show your work
Rated Wh is reduced by efficiency, reserve, battery health, and temperature before it is divided by average load.
Usable energy168 Wh219 Wh x 85% x 90% x 100% x 100%
Fixed station overheadUnknown (not included)60 W / 85% = 70.6 W battery draw; fixed overhead is unknown and excluded
Estimated runtime2h 48m168 Wh / 60 W = 2h 48m
Assumptions
- 219 Wh nominal battery capacity
- AC inverter output path
- 85% conversion efficiency
- 10% reserve kept unused
- 60 W average load from 1 load
- 100% battery health
- 0% temperature loss
- Fixed station overhead unknown; not included
Warnings
- This is an estimate. Real runtime changes with load, temperature, battery age, AC/DC output, and device behavior. Runtime is conditional on successful startup, compatible voltage/connectors and sufficient output. Verify the actual device setup before relying on these hours.
- Within the tracked power limits; compatibility still needs checking
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Planning notes
- Capacity class: 219 Wh. Size the battery for your measured average load and required hours, including reserve.
- Tracked output: 100 W. Compare both running demand and startup demand before using any runtime estimate.
- Solar input limit: 36 W. Actual refill depends on panel voltage/current compatibility, sunlight, angle and charging losses.
Known data gaps
- Unverified or missing specifications remain visible. The confidence label describes the station record, not a tested runtime or approval for emergency use.
- Weight: 2.05 kg. Check the complete carrying setup, cables and battery extensions before choosing this model for travel.
- unknown: —
Models: Duracell
Compare nearby capacity records from the same brand, then check output, weight and missing fields. A larger battery does not establish device compatibility.
Duracell G350
274 Wh · AC output: 350 W · Confidence: Verified
Duracell M150
91 Wh · AC output: unknown · Confidence: Estimated
Duracell M100
55 Wh · AC output: unknown · Confidence: Estimated
Sources
- Duracell M250 user manual (Official; checked 2026-08-21)
- Duracell M-Solar specifications (Official; checked 2026-08-21)
- Duracell M250 product page (Official; checked 2026-08-21)