Diabetes Tech Guide

Charging Your Diabetes Devices on the Road: The Pump, CGM, and Phone Power Guide (2026)

Q: What size power bank can I take on a plane?

Watt-hour (Wh) is the unit airlines use. Power banks at 100 Wh or less need no airline approval. Power banks between 101 and 160 Wh need the airline's approval, with up to two spare batteries. Anything over 160 Wh is not allowed on passenger aircraft. Check the capacity printed on your power bank's label.

Q: What happens to my CGM if my phone dies?

If you read your continuous glucose monitor (CGM) on your phone, the readings stop when the phone dies. That is why the Dexcom G7 receiver matters on the road: it is a small rechargeable device that shows readings without a phone, so it is your insurance policy when the phone battery runs out.

Updated October 2026 · 8 min read

Holiday travel season means long flights, long layovers, and nights in hotels, and your pump, CGM (continuous glucose monitor), and phone are now all medical devices that run on batteries. A dead phone is no longer just a social inconvenience: if your readings live on that phone, a dead battery means a dead CGM. This guide maps exactly what charges with what, the TSA and FAA power rules that decide what goes in your carry-on, and the small charging kit that covers everything.

Everything device-specific below is verified against the manufacturers' current guidance and the regulators' published pages, not traveler lore. The checkpoint side of the trip is covered in TSA Rules for Flying with Diabetes and your pat-down rights at the checkpoint.

The power plan in five moves. 1. Know your batteries: rechargeable pump and receiver charge with their own cables, Medtronic's pump takes an AA, your phone is a medical device charger now. 2. Carry the right cables: the Dexcom and Omnipod manufacturers both say to use the charging cable that came in the box. 3. Pack a spare cable, not just a spare charger (the 20% rule applies to power too). 4. Power banks go in your carry-on, never checked, and check the watt-hours. 5. Abroad, a plug adapter is usually all you need: check for 100-240V on the charger's label. Sugar packets for lows, always: 1 at 60 to 70, 2 below 60.

General guidance only, not medical advice. Your care team owns the medical plan; this page owns the power plan. Device specs change, so confirm your model's current charging specs with the manufacturer before you fly.

Know what each device actually runs on

Charging anxiety comes from treating every device as "a thing with a battery." They are not the same thing. Here is how the common ones are powered, from the manufacturers:

Tandem t:slim X2: a built-in rechargeable lithium polymer battery, charged through a micro-USB port. Tandem says a full charge lasts up to 7 days with normal use, and the pump keeps working while it charges, so you do not disconnect to top it up. Pack the micro-USB cable.
Medtronic MiniMed 780G: the pump takes one AA battery (1.5V). Medtronic recommends a new AA lithium battery for best results, and it also accepts an AA alkaline or a fully charged AA rechargeable (NiMH). There is no charger involved: power on the road means spare AA batteries in your carry-on.
Medtronic Guardian 4 transmitter: the transmitter for the 780G system is rechargeable through its own charger, which comes in the transmitter kit.
Dexcom G7 receiver: a rechargeable battery, charged with the USB cable and power adapter that ship in the receiver kit. Dexcom's labeling is blunt: not using the supplied USB charger and cable may cause the receiver battery to not charge. So do not leave the box cable at home.
Omnipod 5: most users run it from a phone app, which means the phone charger is now a medical-device charger. If you use the optional Omnipod 5 Controller, it is rechargeable through USB-C, and Insulet's safety guidance says to use only the charging adapter and cable that came with it, because third-party accessories can allow higher power and raise the risk of overheating, spark, or fire.

The takeaway: your phone charger earned medical status the day your CGM readings moved to your phone. Treat it like a supply, not an accessory.

The phone problem: readings die when the battery does

This is the one most travelers do not think through until it happens. If your CGM readings live on your phone, a dead phone means no readings, no alerts, no trend arrows. On a travel day, the phone is also doing everything else: boarding passes, maps, rideshares, messages home. Travel days burn phone batteries harder than normal days.

Two defenses. First, the Dexcom G7 receiver is your insurance policy on the road: it shows your readings without a phone, it is rechargeable, and it keeps working when the phone is dead, lost, or out of charge. The site's Dexcom G7 international travel guide makes this case in full. Second, set a personal rule: never let the phone drop below a floor on travel days. When it crosses your floor, it goes on the charger, full stop. Decide the number before the trip, not during the low.

Power banks: the TSA and FAA rules

TSA (the Transportation Security Administration) and the FAA (the Federal Aviation Administration) both have rules about spare batteries, and they are stricter than most travelers expect. Here is the plain version:

Carry-on only, never checked. The TSA's "What Can I Bring?" guidance says portable chargers and power banks containing a lithium ion battery must be packed in carry-on bags. Spare lithium batteries, which include power banks, are prohibited in checked luggage.
The FAA counts power banks as spare lithium batteries. Its PackSafe guidance says power banks, spare batteries, and lithium batteries under 160 watt-hours must remain with passengers in the aircraft cabin, and anything over 160 watt-hours is not allowed on passenger aircraft at all.
Watt-hour (Wh) is the unit that matters. A watt-hour measures how much energy the battery stores; it is printed on the power bank's label. At 100 Wh or less, no airline approval is needed. Between 101 and 160 Wh, you need the airline's approval, and the limit is two spare batteries. Over 160 Wh, leave it home.
If your carry-on gets gate-checked, take the power bank out. The moment your bag leaves your hands for the hold, any power bank inside it is in violation. Put it in your personal item before you hand the bag over.
Protect the terminals. Loose batteries and power banks ride better in a case or pouch where nothing metal can bridge the terminals. This is also why they live in the bag you keep, not the bag you check.

Practical pick: a power bank in the 10,000 to 20,000 mAh range (roughly 37 to 74 Wh, well under the 100 Wh line) will refill a phone and top up a receiver or pump without any airline-approval conversation. Check your own bank's label for the Wh rating rather than estimating.

Packing power for the trip? Our free calculator builds a personalized supply list based on your insulin type and exact trip length, with a 20% safety buffer built in. Add your spare cable and spare batteries to it. Build My Packing List

Charging at the airport and on the plane

Airports are full of outlets and none of them are where you are sitting when you need them. A short strategy beats a long search:

Top up at the gate, not on the plane. Seat-back outlets and USB ports are inconsistent: some are unpowered, some deliver a trickle that barely charges a phone, and some aircraft have none. The gate area is your reliable charge stop, so build ten minutes of outlet time into the layover plan instead of hoping for seat power.
Carry the wall brick, not just the cable. USB ports on rental-car dashes, hotel lamps, and some airport furniture deliver low power. A real wall adapter from a wall outlet charges faster and reliably. One multi-port wall adapter covers phone, receiver, and pump with a single outlet.
On a long-haul flight, ration. If the seat USB is your only option for eight hours, charge the phone first (your readings), then the receiver (your backup). Do not burn the trickle on a tablet while your medical devices wait.

The international kit: adapters, not converters

Overseas outlets have different prong shapes, and there are two different products for that, which travelers constantly mix up:

A plug adapter changes only the prong shape so your charger physically fits the foreign outlet. It does not change the voltage.
A voltage converter changes the voltage itself. You only need one if a device is built for a single voltage, like some hair dryers.

For your diabetes kit, you almost certainly need only an adapter. Most modern phone, laptop, and USB chargers are dual voltage, meaning they are built to handle anything from 100 to 240 volts. Check the fine print on the charger itself: if it says "Input: 100-240V," the charger works anywhere in the world with just the correct plug adapter. If a device lists a single voltage, it needs a converter, or you leave it home. One universal adapter with multiple plug types covers a multi-country itinerary; pair it with the multi-port wall adapter and every device charges off one outlet.

The travel charging kit checklist

Here is the full power kit, in packing order:

Your phone charger and cable (this is now medical equipment; pack a spare cable as your 20% buffer).
Your device's own charging cable: Dexcom's supplied USB cable for the G7 receiver, the micro-USB cable for the t:slim X2, the Omnipod 5 Controller's own adapter and cable if you use one.
Spare AA batteries if you run a Medtronic pump that takes them; new AA lithium is the manufacturer's pick.
A power bank at or under 100 Wh, in your carry-on (never checked), terminals protected, label readable.
A multi-port wall adapter so one outlet charges phone, receiver, and pump at the hotel.
For international trips: a universal plug adapter. Check every charger's label for 100-240V before plugging in abroad.
The Dexcom G7 receiver itself, charged, as the phone-independent backup. Charge it the night before travel day.
Sugar packets in a pocket you will reach, 1 at 60 to 70, 2 below 60, because a low does not wait for a charger.

One night-before habit ties it together: every device and the power bank go on the chargers the evening before you fly. Devices do not have to be drained to charge fully, so there is no reason to start travel day at anything less than 100 percent.

Frequently Asked Questions

Q: Can I pack a power bank in my checked bag when flying?

A: No. The TSA requires portable chargers and power banks containing a lithium ion battery to be packed in carry-on bags, and spare lithium batteries are prohibited in checked luggage. The FAA also requires power banks under 160 watt-hours to stay with you in the aircraft cabin. If your carry-on gets gate-checked, take the power bank out and keep it with you.

Q: What size power bank can I take on a plane?

A: Watt-hour (Wh) is the unit airlines use to measure stored energy. Power banks at 100 Wh or less need no airline approval. Between 101 and 160 Wh, you need the airline's approval, with up to two spare batteries. Anything over 160 Wh is not allowed on passenger aircraft. Check the capacity printed on your power bank's label.

Q: What if my insulin pump battery dies while traveling?

A: It depends on the pump. The Tandem t:slim X2 has a built-in rechargeable lithium polymer battery that charges through a micro-USB port and lasts up to 7 days on a full charge, and it keeps working while charging. The Medtronic MiniMed 780G takes a single AA battery, with new AA lithium recommended for best results, so pack spare AAs. Talk to your care team before your trip about a backup plan for pump power loss.

Q: Do I need a voltage converter to charge diabetes devices abroad?

A: Usually not. A travel plug adapter changes only the prong shape so your charger fits the foreign outlet; it does not change the voltage. Most modern phone, laptop, and USB chargers are dual voltage, labeled 100-240V, and need only the correct plug adapter. Check the fine print on each charger before you plug it in abroad.

Q: What happens to my CGM if my phone dies?

A: If you read your CGM (continuous glucose monitor) on your phone, the readings stop when the phone dies, along with the alerts. That is why the Dexcom G7 receiver matters on the road: it is a small rechargeable device that shows readings without a phone, so it is your insurance policy when the phone battery runs out.

General guidance only, not medical advice. Device charging specs change; confirm your model's current specs with the manufacturer before you fly. Insulin dosing and device decisions are personal: work with your care team on your plan.