AI voice recorder battery life on Comu Note Pro is 45 hours of continuous recording, and on Comu Action Pro it is up to 70 hours. Both have 16 GB of storage: about 500 hours of audio on Note Pro, about 1,000 on Action Pro. A full charge takes about 1.5 and 2 hours respectively (checked Nov 9, 2026).
To plan a day or a trip, jump to the planning tables. For the storage numbers, skip to 16 GB in hours.
How many hours does an AI voice recorder record on one charge?
Comu Note Pro records for 45 hours on one charge, and Comu Action Pro records for up to 70 hours. Both figures are continuous recording hours: the time the recorder keeps recording from a full battery.
| Spec | Comu Note Pro | Comu Action Pro |
|---|---|---|
| Continuous recording | 45 hours | Up to 70 hours |
| Battery capacity | 400 mAh polymer, 3.7 V | 1,000 mAh polymer |
| Full charge time | About 1.5 hours | About 2 hours |
| Charging interface | Magnetic charging, 5V/0.5A | USB-C, 5V/1A |
| Port for file transfer | USB 2.0 | USB-C 2.0, which also charges |
| Local storage | 16 GB | 16 GB |
| Hours of audio in 16 GB | About 500 hours | About 1,000 hours |
Comu Note Pro also has a standby time of 107 days. Standby is a separate spec from recording, and the next section defines both.
Comu Note Pro is card-sized at 85.7 × 51.7 × 3.1 mm and weighs 27.6 g, with an aluminum body. Comu Action Pro measures 91 × 60 × 5.5 mm. The recording figures above belong to the device, not to a subscription: on the free Starter plan, Premium and Elite alike, the device has the same battery, the same charging and the same 16 GB.
What do "continuous recording hours" and "standby days" mean?
Continuous recording hours are the number of hours a recorder keeps recording on one full charge.
Standby days are the number of days the recorder stays powered on and idle on one full charge, with no recording running. Comu Note Pro's standby time is 107 days.
The two specs measure different states of the same battery, so you do not add them together. A day spent recording draws on the recording figure. A day spent idle draws on the standby figure.
Three more terms appear in the spec table:
- Battery capacity (mAh). Milliamp-hours describe how much charge the battery holds. Comu Note Pro has a 400 mAh polymer battery rated at 3.7 V, and Comu Action Pro has a 1,000 mAh polymer battery.
- Full charge time. The time from an empty battery to a full one on the input listed in the table: 5V/0.5A for Comu Note Pro and 5V/1A for Comu Action Pro.
- Hours of audio in 16 GB. How many hours of recording the built-in storage holds.
What changes AI voice recorder battery life?
Recording and standby are the two states the specs measure, and battery life follows which one the device is in. Recording is measured in hours and standby in days: Comu Note Pro runs 45 hours of recording or 107 days of standby on one charge.
Three points apply when you plan around a charge:
- Recording or idle. Continuous recording hours count time spent recording. Time spent powered on but idle is counted in standby days.
- Idle auto power-off. The Comu app's device management settings include an idle auto power-off setting.
- The "up to" in the Action Pro figure. Comu Action Pro's 70 hours is the maximum continuous recording time, so plan with 70 hours as the upper end of the range.
The device management settings in the app also let you view device storage, run OTA firmware upgrades, reset to factory settings and unbind the device while clearing its data.
How long is the voice recorder charging time for Comu Note Pro and Comu Action Pro?
Comu Note Pro takes about 1.5 hours to charge fully, and Comu Action Pro takes about 2 hours.
Comu Note Pro charging
- It uses magnetic charging with the cable from the box, at 5V/0.5A.
- The box holds the device, a magnetic protective case, a magnetic ring, a charging cable, an OTG adapter and a user guide.
Comu Action Pro charging
- It charges directly through its USB-C port at 5V/1A.
- The same USB-C 2.0 port transfers files, so one cable covers charging and moving recordings to a computer.
- The box holds the device, a magnetic ring, a USB-C charging cable, a quick start guide and a safety manual.
How much AI voice recorder storage do you get with 16 GB?
Comu Note Pro and Comu Action Pro each have 16 GB of local storage, which holds about 500 hours of audio on Comu Note Pro and about 1,000 hours on Comu Action Pro. Recordings are saved on the device itself, so the recorder works without a phone connection, and they sync to the Comu app afterward.
Comu Note Pro syncs recordings to the app in the background over Bluetooth and can switch to Wi-Fi for a faster transfer, which suits long recordings. Comu Action Pro has Bluetooth 6.1 and Wi-Fi 6 on the 2.4 GHz band, and its USB-C port also transfers files.
In the Comu app, the device management settings show the device storage, so you can check how much of the 16 GB is in use before a long stretch of recording.
How do you plan a day or a trip with these numbers?
Divide the recording hours on one charge by the hours you record each day, then check the result against your total hours of recording and your 16 GB. The figures to use are 45 hours for Comu Note Pro and up to 70 hours for Comu Action Pro.
Follow these steps:
- Pick your daily recording hours. Count the hours the recorder runs, not the hours you spend at work. The screen helps: on Comu Action Pro a recording animation appears and a timer starts when recording begins, and the screen shows "Saved" when you stop. Comu Note Pro gives feedback through vibration and its screen.
- Divide. Recording hours per charge divided by daily recording hours gives the days of recording from one full charge.
- Multiply for a trip. Daily recording hours multiplied by the number of days gives the total hours. Compare that total with 45 or 70.
- Schedule the recharge. One recharge takes about 1.5 hours on Comu Note Pro and about 2 hours on Comu Action Pro. Put it in a block when the device is idle.
- Check storage. Compare your total recording hours with 500 hours (Comu Note Pro) or 1,000 hours (Comu Action Pro).
The first table below gives the days of recording from one full charge. It divides the continuous recording figure by daily recording hours and does not count idle time in between.
| Hours recorded per day | Days from one charge, Comu Note Pro | Days from one charge, Comu Action Pro |
|---|---|---|
| 1 hour | 45 days | 70 days |
| 2 hours | 22.5 days | 35 days |
| 3 hours | 15 days | About 23.3 days |
| 4 hours | About 11.3 days | 17.5 days |
| 6 hours | 7.5 days | About 11.7 days |
| 8 hours | About 5.6 days | About 8.8 days |
| 10 hours | 4.5 days | 7 days |
| 12 hours | About 3.8 days | About 5.8 days |
The second table turns a trip into the number of charges. A trip needs one charge when its total recording hours fit under the figure, and one more charge for each additional block of 45 or 70 hours. The charge count includes the full charge you start with.
| Total hours to record | Charges needed, Comu Note Pro | Charges needed, Comu Action Pro |
|---|---|---|
| 20 hours | 1 charge, 25 hours left | 1 charge, 50 hours left |
| 40 hours | 1 charge, 5 hours left | 1 charge, 30 hours left |
| 60 hours | 2 charges | 1 charge, 10 hours left |
| 100 hours | 3 charges | 2 charges |
| 150 hours | 4 charges | 3 charges |
For example, a five-day trip with 8 hours of recording a day totals 40 hours. That fits inside Comu Note Pro's 45 hours with 5 hours to spare, and inside Comu Action Pro's 70 hours with 30 hours to spare. A ten-day trip at the same pace totals 80 hours, which is above both figures, so each device needs two charges.
Here is how a full 8-hour recording day uses each device. Comu Note Pro uses 8 of its 45 hours, or about 18 percent of a charge. Comu Action Pro uses 8 of its 70 hours, or about 11 percent of a charge. After five such days, both devices have recorded 40 hours: Comu Note Pro has 5 hours left and Comu Action Pro has 30.
If your recording days add up to 45 hours or less between charges, Comu Note Pro covers them. If they add up to 46 to 70 hours, Comu Action Pro covers them. Beyond those figures, add one recharge for each extra block: 45 hours of recording (about 1.5 hours on the charger) on Comu Note Pro, or 70 hours (about 2 hours on the charger) on Comu Action Pro.
Do Starter, Premium and Elite change battery life or storage?
No. Battery life, charging time and 16 GB of storage are hardware specs, and they are the same on the free Starter plan, Premium and Elite. The plan decides what the Comu app does with your recordings after they sync.
| What you check | Starter (free with the device) | Premium or Elite |
|---|---|---|
| Continuous recording | 45 hours (Note Pro) or up to 70 hours (Action Pro) | Same |
| Charging time | About 1.5 hours (Note Pro) or about 2 hours (Action Pro) | Same |
| Local storage | 16 GB | Same |
| Real-time transcription | Unlimited | Unlimited |
| Transcription and summary after sync | You start them in the app | AI Note Automation starts them for you |
AI Note Automation transcribes and summarizes a recording automatically once it syncs from the device to the app. The switch sits in Me, under personal preferences. Subscriptions are bought inside the Comu app, from the App Store or Google Play, and the website does not sell them.
How do you check a battery spec on any voice recorder?
A battery figure on a spec sheet only helps when you know what it measures. Ask five questions of any voice recorder, Comu included, before you plan around a number.
- Is the figure continuous recording or mixed use? Continuous recording means the recorder runs without stopping from a full battery. Mixed use includes pauses, screen time and standby, so the same device shows a larger number of hours.
- Is standby measured in days or in hours of recording? Standby days count a powered-on device that is not recording. They do not add to recording hours, so keep the two figures apart in your plan.
- What is the battery capacity, and what is the charging time? Capacity in milliampere-hours (mAh) tells you how much charge the battery holds, and charging time tells you how long a refill takes. Recording hours come from capacity and the device's own power draw together, so read capacity next to the stated hours.
- How much storage is there, and how is it counted? Storage is a size in gigabytes, and the hours of audio that fit depend on how the recorder encodes sound. Use the hours the manufacturer states for the model, not your own conversion from gigabytes.
- What else does the number depend on? Recording is one use of the battery. Syncing, the screen and wireless connections also draw power, so a day with heavy syncing ends the charge earlier than a day with none.
Run the same five questions on two recorders and you compare like with like. For Comu, questions 1 to 4 are answered in the tables above, and question 5 is why the planning tables leave room instead of promising exact hours.
Which Comu recorder fits your battery plan?
Comu Note Pro suits stretches of 45 recording hours or less between charges, and Comu Action Pro suits stretches of up to 70 recording hours.
| If your recording looks like this | Comu Note Pro | Comu Action Pro |
|---|---|---|
| Up to 45 hours before you can charge | Fits on one charge | Fits on one charge, with at least 25 hours left |
| 46 to 70 hours before you can charge | Needs a recharge | Fits on one charge |
| More than 70 hours before you can charge | Needs 2 or more charges | Needs 2 or more charges |
| Up to 500 hours of audio kept on the device | Fits in 16 GB | Fits in 16 GB |
| 501 to 1,000 hours of audio kept on the device | Exceeds the 16 GB figure | Fits in 16 GB |
Comu Action Pro costs $179.99 (checked Nov 9, 2026) at store.comu.com, and Comu Note Pro costs $128.99 at store.comu.com. The free Starter plan comes with the device.
Frequently Asked Questions
How long does Comu Note Pro record on one charge?
Comu Note Pro records for 45 hours of continuous recording on one full charge. A full charge takes about 1.5 hours, and the battery is a 400 mAh polymer cell rated at 3.7 V.
How long does Comu Action Pro record on one charge?
Comu Action Pro records for up to 70 hours of continuous recording on one full charge. Its 1,000 mAh polymer battery charges in about 2 hours through USB-C.
What is the standby time of Comu Note Pro?
Comu Note Pro has a standby time of 107 days. Standby counts days spent powered on and idle, and it is a separate figure from the 45 hours of continuous recording.
How many hours of audio fit in 16 GB?
16 GB holds about 500 hours of audio on Comu Note Pro and about 1,000 hours on Comu Action Pro.
How long is the charging time for each Comu recorder?
Comu Note Pro takes about 1.5 hours to charge fully and Comu Action Pro takes about 2 hours.
Which port does Comu Action Pro charge through?
Comu Action Pro charges through its USB-C port at 5V/1A, which takes about 2 hours. The same USB-C 2.0 port also transfers files, and a USB-C charging cable is in the box.
Does a subscription change the battery life?
No. Battery life, charging time and 16 GB of storage are the same on the free Starter plan, Premium and Elite. Premium or Elite adds AI Note Automation, which transcribes and summarizes recordings automatically after they sync.
Related reading
- Comu AI Transcription, Summaries & Feature Guide
- Comu Action Pro Price and Subscription Plans
- Unlimited Transcription Recorders: Limits Explained
- How to Record a Phone Call on iPhone, Samsung and With a Recorder (2026)
Sources
Comu specifications and prices were checked on Nov 9, 2026.
- Comu, Comu Action Pro
- Comu, Comu Note Pro
