Start with watt-hours.
Capacity describes stored energy, not guaranteed nights.
Planning tool
See what your comfort settings cost in runtime.
Change the battery, CPAP draw, humidifier and heated tubing to build a realistic planning range before purchase.
Preparing your planning estimate…
Your estimated runtime
ES960 PRO
297.6Wh rated capacityPlanning estimate, including a 15% reserve
— hours
— full planned nights at an estimated —W total load.
Compare with PRO
How this estimate is calculated
Before the 15% reserve (not the planning target)—
Your planned night length—
Planning hours = battery Wh × 0.82 × 0.85 ÷ total watts. Both allowances are planning assumptions, not measured performance guarantees.
Read the result correctly
An estimate is a planning range, not a promise.
Battery watt-hours are fixed. CPAP demand changes through the night, so a complete overnight test remains the final proof.
Allow conversion loss.
The calculator reserves 18% for conversion and system overhead.
Add comfort heat.
Humidification and heated tubing can become the largest load.
Keep a reserve.
The plan-around figure holds back another 15% for real-world variation.
What changes overnight
The machine is only part of the load.
- Pressure and machine modeMotor demand changes with the settings used at bedtime.
- Mask leakageMore airflow can mean more power consumption.
- Humidifier and heated tubeHeating can materially shorten runtime.
- Temperature and battery conditionCold and aging reduce available energy.
Read the result correctly
An estimate is a planning range, not a promise.
Battery watt-hours are fixed. CPAP demand changes through the night, so a complete overnight test remains the final proof.
Start with watt-hours.
Capacity describes stored energy, not guaranteed nights.
Allow conversion loss.
The calculator reserves 18% for conversion and system overhead.
Add comfort heat.
Humidification and heated tubing can become the largest load.
Keep a reserve.
The plan-around figure holds back another 15% for real-world variation.
What changes overnight
The machine is only part of the load.
- Pressure and machine modeMotor demand changes with the settings used at bedtime.
- Mask leakageMore airflow can mean more power consumption.
- Humidifier and heated tubeHeating can materially shorten runtime.
- Temperature and battery conditionCold and aging reduce available energy.
Before you decide
Questions worth answering before checkout.
Confirm compatibility and realistic runtime before you buy.
Open support centerHow do I know which cable my CPAP needs?
Start with the exact machine model and the voltage printed on its original power adapter. The compatibility tool narrows the cable family, and support can confirm the final connection before purchase.
Why is my runtime lower with the humidifier on?
Heating water and a breathing tube adds significant power demand. Published multi-night estimates assume humidification and heated tubing are off unless the page states otherwise.
Can I take every EASYLONGER battery on a plane?
No. ES270 is the airline-oriented 99.9Wh model. Higher-capacity ES720 and ES960 PRO exceed common passenger-aircraft battery limits and should not be presented as flight batteries.
What should I test before relying on backup power?
Confirm the cable and voltage, charge the battery fully, disable or account for comfort heat, and complete an overnight test with the exact CPAP settings you normally use.
What happens if the product is not right for my setup?
The official store currently presents a 30-day return window and direct technical support. Keep packaging and contact support with your order number and exact CPAP model.
5-year official-store warrantyFor eligible official-site purchases
Direct technical supportCompatibility and setup help
Ready to validate?
Match the exact CPAP before choosing the cable.
Use the estimate to narrow capacity, then confirm the machine family and voltage.