Measured 2026-08-08 · R.M.SKU CAL-LGT-PB20
lightLight & Power
Field Power Bank 20K
20,000 mAh, USB-C in and out, cold-rated
4.7 / 5388 reviews
Publishes what it actually delivers, warm and cold. Nine thousand eight hundred milliamp-hours at −10°C is the number that matters in December.
$79.00
CAL-LGT-PB20 · USD
1
- Standard shipping $8.95 · 3–5 business days. Free over $99.
- 60-day returns. One-time purchase — no subscription and no recurring charge.
- Weight 394 g / 13.9 oz, measured 2026-08-08 on West Mountain CBA IV load tester. The same numbers are printed on the Field Card in the box.
Your card statement will show CALIBRATED SUPPLY for this order, not “Calibrated”. Questions? support@calibratedsupply.com · +1 (714) 269-7133.
Measured
How we measure- Weight
394 g / 13.9 oz
- Capacity
20,000 mAh / 74 Wh
Under the 100 Wh airline carry-on limit, which is why it is this size and not larger.
- Delivered capacity at 20°C
13,900 mAh
Measured to a phone at 5 V. Every bank loses this much; most do not print it.
- Delivered capacity at −10°C
9,800 mAh
Same test, cold-soaked four hours. Cold costs you about 30%.
- Output
USB-C 30 W PD, USB-A 18 W
- Recharge time
3 h 20 min at 30 W
Taken 2026-08-08 on West Mountain CBA IV load tester by R.M.. The same values are printed on the Field Card in your box, so the page and the carton can never disagree.
What it is made of
Lithium cells with a low-temperature chemistry
Delivers usefully below freezing, which standard cells do not.
Rubberised shellIPX4
Rain and snow. Not submersion.
The full description
Every power bank prints its cell capacity and none of them print what comes out the other end. Conversion losses take roughly 30% before you even start, and cold takes another 30% on top of that.
So this listing has all three numbers: 20,000 mAh of cells, 13,900 mAh delivered at room temperature, 9,800 mAh delivered after four hours cold-soaked at −10°C. That last figure is the one to plan a late-season hunt around.
Seventy-four watt-hours puts it under the 100 Wh airline carry-on limit, so it flies to a hunt in your carry-on, which is the only place a lithium battery is allowed to travel.
Bought for
Multi-day hunts, cell cameras, and anyone whose phone is also their map.
Not for
Running the 12V Boot Dryer — 22 W will empty this in about four hours.
Field notes
- 01Carry it inside a layer in the cold, not in an outside pocket. Warm cells deliver more.
- 02Charge the headlamp and the rangefinder spare at the truck, not at camp.
- 03Never in checked baggage. Lithium banks are carry-on only, on every airline.
On the bench
9,800 mAh
delivered after 4 h cold-soaked at −10°C
Our own testing, on production samples, with the method stated in the spec table above. Nothing here is a claim about what will happen on a hunt.
In the box
- Field Power Bank 20K
- USB-C cable, 300 mm
- Field Card
Construction, care and warranty
- Construction
- Lithium-ion cells with a low-temperature chemistry; USB-C PD 30 W bidirectional port; USB-A 18 W port; four-LED charge indicator; rubberised polycarbonate shell, IPX4.
- Care
- Store at about half charge if it will sit for a season. Do not store flat, and do not store it hot.
- Warranty
- Two years.
- Bought for
- Western, Late season, Waterfowl
- SKU
- CAL-LGT-PB20
- Price
- $79.00 USD
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