BiXPower LF1220-AS11 –
256Wh LiFePO4 Rechargeable
Backup Battery for ResMed
AirSense 11 CPAP Machines
The BiXPower LF1220-AS11
is a high-capacity, long-life
rechargeable battery power
system designed for compatible
ResMed AirSense 11 CPAP machines.
This complete package combines
a 12.8V 20Ah (256Wh)
lithium iron phosphate
(LiFePO4) battery
with a compact DC-to-DC
power converter that delivers
regulated 24V DC power
through a special AirSense 11
connector.
Ideal for home emergency
backup, power outages,
camping, RV travel, and
off-grid CPAP operation.
The battery system also
supports a UPS-style
power configuration,
allowing the battery to
serve as backup power
while connected to a
compatible charging source.
Under favorable low-power
conditions with heated
humidification turned off,
the battery may provide
approximately 3–4 nights
of CPAP operation.
Actual runtime depends
on machine settings and
power consumption.
BiXPower LF1220-AS11 battery
and regulated 24V converter.
256Wh Rechargeable Capacity
12.8V 20Ah lithium iron
phosphate battery.
Long Cycle Life
Rated for approximately
2,000 charge-discharge cycles.
Regulated 24V Power
Special converter for
compatible AirSense 11 machines.
UPS-Style Backup Capability
Battery system designed
for charging and powering
equipment in a backup setup.
Portable Design
Approximately 5.6 lb
battery with carrying bag.
Fast AC Charging
Approximately four-hour
charging time with
included charger.
Designed for ResMed
AirSense 11 CPAP Machines
The LF1220-AS11 is configured
to supply regulated 24V DC
power to compatible ResMed
AirSense 11 CPAP machines.
The included converter accepts
variable DC input from the
12.8V LiFePO4 battery and
delivers stable 24V output
through the appropriate
AirSense 11 power connector.
Battery and AirSense 11
converter connection.
AirSense 11 connection example.
CPAP machine not included.
Compatibility:
This package is designed
for compatible ResMed
AirSense 11 machines.
Other CPAP models may
require a different
converter or connector.
Why Choose a LiFePO4
Rechargeable Battery?
Lithium iron phosphate,
commonly called LiFePO4
or LFP, is a rechargeable
battery chemistry valued
for long cycle life,
thermal stability,
and dependable energy storage.
Long Battery Cycle Life
The LF1220 battery is rated
for approximately
2,000 charge-discharge
cycles under the
manufacturer's specified
conditions.
Actual service life depends
on depth of discharge,
temperature, charging habits,
and operating conditions.
Stable Battery Chemistry
LiFePO4 chemistry generally
offers better thermal stability
than many other lithium-ion
battery chemistries.
The battery also includes
electronic protection
functions to help protect
against abnormal charging
and discharging conditions.
Lightweight Compared
with Lead-Acid Batteries
The LF1220 weighs
approximately 5.6 pounds.
A comparable-capacity
lead-acid battery may
weigh substantially more.
This makes the LF1220
convenient for portable
backup power applications.
12.8V 20Ah / 256Wh
Rechargeable Battery
BiXPower LF1220
256Wh rechargeable battery.
The LF1220 battery has
a nominal voltage of 12.8V
and a capacity of 20Ah,
providing 256 watt-hours
of nominal stored energy.
The battery features two
power connections that
can be used for compatible
charging or discharging
applications.
Battery Connectors
LF1220 battery power connections.
-
DC Barrel Connector:
5.5 × 2.5mm female connector,
center positive.
-
Anderson Powerpole Connectors:
Red wire positive;
black wire negative.
Important:
Always confirm connector
polarity, voltage, and
current ratings before
connecting other equipment.
Never connect incompatible
power sources directly
to the battery.
Portable Carrying Bag
The LF1220 battery is
shown with a convenient
carrying bag that helps
make transportation easier.
Portable carrying bag
for the LF1220 battery.
The compact battery size
and manageable weight
make it suitable for use
at home, while camping,
or in an RV.
How Long Can the LF1220
Power an AirSense 11?
The LF1220 stores 256Wh
of nominal energy.
Actual CPAP operating time
depends on machine pressure,
humidifier settings,
heated tubing, converter
losses, and battery condition.
The following calculations
use an illustrative 85%
usable-energy factor.
They are estimates, not
guaranteed runtime figures.
| Average CPAP Power |
Estimated Runtime |
| 5W |
43.5 hours |
| 8W |
27.2 hours |
| 10W |
21.8 hours |
| 12W |
18.1 hours |
| 15W |
14.5 hours |
| 20W |
10.9 hours |
| 25W |
8.7 hours |
| 30W |
7.3 hours |
| 40W |
5.4 hours |
| 50W |
4.4 hours |
The advertised 3–4-night
runtime is possible only
under sufficiently low
average power consumption.
It is not guaranteed
for every user.
Tips to Extend CPAP Runtime
-
Turn off heated humidification
when appropriate for your therapy.
-
Disable heated tubing
when practical.
-
Use prescribed pressure settings.
-
Fully charge the battery
before overnight use.
-
Test your CPAP setup
before relying on it
during an outage.
Compact Regulated
24V DC Converter
The included DC-to-DC
power converter transforms
the LF1220 battery's
variable DC output into
regulated 24V power
for compatible AirSense 11
machines.
Compact regulated 24V
AirSense 11 converter.
Converter Specifications
| Converter Type |
DC-to-DC regulated
power converter |
| Input Voltage Range |
9–32V DC |
| Output Voltage |
Regulated 24V DC |
| Maximum Output Power |
65W |
| Input Connector |
5.5 × 2.5mm
barrel connector |
| Output Connector |
Special connector for
compatible ResMed AirSense 11 |
| Dimensions |
90 × 36 × 27mm
(approximately 3.5 × 1.4 × 1.1 in) |
| Weight |
Approximately 142g (5 oz) |
Compact, Lightweight Design
Small, lightweight DC converter.
Power Rating:
The converter supports
up to 65W output.
Confirm that your complete
AirSense 11 configuration,
including heating accessories,
does not exceed this rating.
UPS-Style Backup Power
for AirSense 11
The LF1220 battery is
marketed with UPS-style
backup functionality.
In a compatible charging
and power arrangement,
the battery can serve as
an energy reserve when
external power is unavailable.
This makes the system
useful for customers
concerned about overnight
power outages.
UPS Notice:
The product listing does
not specify an automatic
transfer time or guarantee
uninterrupted CPAP operation.
Test the complete setup
under controlled conditions
before depending on it
for overnight therapy.
How to Charge the LF1220 Battery
The package includes
a dedicated AC charger
compatible with
100–240V AC input,
50/60Hz.
Typical charging time
is approximately
four hours,
depending on battery
condition and charging
conditions.
Charging the LF1220 battery
with the included AC charger.
Charging Instructions
-
Use the supplied
LiFePO4-compatible charger.
-
Connect the charger to
the designated compatible
battery charging connector.
-
Connect the charger
to an AC outlet.
-
Monitor the charging status
according to the charger
instructions.
-
Disconnect the charger
when charging is complete
if directed by the manual.
Charging Temperature:
Charge the battery only
within the specified
0°C to 45°C temperature range.
How to Connect the Battery
to Your AirSense 11
-
Fully charge the LF1220 battery.
-
Connect the regulated
24V converter input
to the battery's
compatible DC output.
-
Connect the converter's
special AirSense 11 plug
to the CPAP power input.
-
Verify that the connection
is secure and polarity
is correct.
-
Start the CPAP machine
and confirm normal operation.
Battery-to-converter connection.
Complete AirSense 11
battery power arrangement.
Important:
Do not connect the LF1220
battery's 12.8V output
directly to the AirSense 11.
Use the supplied regulated
24V converter.
LF1220 Battery
Technical Specifications
| Package Model |
LF1220-AS11 |
| Battery Model |
LF1220 |
| Battery Chemistry |
Lithium iron phosphate
(LiFePO4 / LFP) |
| Nominal Voltage |
12.8V DC |
| Nominal Capacity |
20Ah |
| Energy Capacity |
256Wh |
| Minimum Battery Voltage |
10V |
| Maximum Battery Voltage |
14.6V |
| Continuous Discharge Current |
20A |
| Maximum Discharge Current |
25A |
| Battery Dimensions |
178 × 165 × 75mm
(7.1 × 6.5 × 3 inches) |
| Battery Weight |
Approximately 5.6 lb |
| DC Barrel Connector |
5.5 × 2.5mm female,
center positive |
| Additional Connector |
Anderson Powerpole,
red positive / black negative |
| Charging Temperature |
0°C to 45°C |
| Discharge Temperature |
-20°C to 60°C |
| Storage Temperature |
-20°C to 40°C |
| Rated Cycle Life |
Approximately 2,000 cycles |
| Warranty |
One-year limited warranty |
Built-In Battery
Protection Features
The LF1220 includes
electronic protection
functions designed to
help protect the battery
during charging and discharge.
- Cell balancing
- Overcharge protection
- Over-discharge protection
- Over-current protection
- Temperature protection
- Secondary protection circuitry
Always use compatible
charging equipment and
follow the manufacturer's
operating instructions.
Package Contents
Standard LF1220-AS11
package contents.
-
1 × LF1220 Battery:
12.8V 20Ah / 256Wh
LiFePO4 rechargeable battery
-
1 × AirSense 11 DC Converter:
Regulated 24V output,
65W maximum
-
1 × AC Battery Charger:
100–240V AC input
with power cord
ResMed AirSense 11
CPAP machine is not included.
A carrying bag is illustrated
on the product page.
Please confirm whether
the bag is included
with the current package
before ordering.
Important Airline
Travel Information
256Wh Battery –
Not Permitted as Ordinary
Passenger Airline Baggage
The LF1220 battery has
a nominal capacity of 256Wh.
This exceeds the standard
160Wh upper limit applicable
to certain larger spare
lithium batteries permitted
with airline approval
under U.S. FAA passenger rules.
Do not pack this battery
as ordinary passenger
carry-on or checked baggage.
For current airline
battery requirements, visit
FAA Airline Passengers and Batteries
.
Frequently Asked Questions
Does LF1220-AS11 work
with ResMed AirSense 11?
Yes. It is designed
for compatible AirSense 11
machines using the included
regulated 24V DC converter.
What type of battery
does this package use?
It uses a 12.8V 20Ah
lithium iron phosphate
(LiFePO4) rechargeable battery
with 256Wh nominal capacity.
How long can it
power an AirSense 11?
Runtime depends on
the machine's average
power consumption.
The product is advertised
for approximately 3–4 nights
under favorable low-power
conditions with heated
humidification off.
Can it be used
during power outages?
Yes. The battery can
provide backup power
when properly connected
to a compatible AirSense 11.
Does it have
UPS functionality?
The LF1220 is marketed
with UPS-style backup
capability. Automatic
transfer performance
and uninterrupted operation
should be verified
for your specific setup.
Can I connect the
battery directly to AirSense 11?
No. Use the included
regulated 24V DC converter.
How long does
charging take?
Approximately four hours
with the supplied charger,
depending on charging conditions.
How many charging
cycles is the battery rated for?
The LF1220 is rated
for approximately
2,000 cycles under
specified conditions.
Actual life depends
on usage and storage.
Can I use
heated humidification?
The complete CPAP configuration
must remain within the
converter's 65W rating.
Heating functions may
significantly reduce runtime.
Is the CPAP
machine included?
No. The AirSense 11
CPAP machine is not included.
Warranty and
Product Support
The BiXPower LF1220-AS11
includes a
one-year limited warranty
covering qualifying
manufacturing and
quality defects.
Rechargeable batteries
naturally lose capacity
with age and use.
Normal battery wear
is not considered
a manufacturing defect.
For compatibility questions,
technical support, and
additional power accessories,
visit
BiXPower.com
.
BiXPower LF1220-AS11 –
Long-life 256Wh LiFePO4
rechargeable battery power
with regulated 24V output
for compatible ResMed
AirSense 11 CPAP machines.
