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"Pass-through charging" appears on nearly every Starlink Mini battery listing. It sounds simple: plug the battery into a charger, and it powers the dish while it refills itself. In practice the term covers several different behaviours, and the difference matters. Some packs switch smoothly; others briefly cut their output when the charger connects or disconnects, and the Mini restarts. This guide explains what is going on inside, the variations you will meet, and how to test a pack before you rely on it in a car, at camp or as a home backup.
What happens inside the pack
A power bank has three jobs: charging its cells from an input, converting cell voltage to the output voltage, and managing heat and protection. With pass-through, all three run at once. Energy from the charger either goes into the cells and back out again, or, in a bypass design, part of it goes straight to the output. The second approach is more efficient and gentler on the cells, because they are not constantly charged and discharged in tiny cycles.
PeakDo, for example, describes the LinkPower 2 as supporting both pass-through and bypass power, and says bypass mode can feed the Mini directly from external power. That is the behaviour you want when a pack will spend most of its life connected to a car or wall charger.
Types you will see on listings
| Behaviour | What it means | Effect on the Mini |
|---|---|---|
| No pass-through | Output turns off while charging | Mini goes offline whenever you charge |
| Basic pass-through | Output stays on, but may reset when input changes | Possible reboot on plug-in or unplug |
| Seamless pass-through | Output holds through input changes | No interruption |
| Bypass | Input powers the output directly; battery is reserve | No interruption, less battery wear |
Listings rarely say which of these you are getting. That is why testing matters.
Packs that state pass-through
| Product | Key specs | Link |
|---|---|---|
| PeakDo LinkPower 2 Starlink Mini Battery Pack (99Wh) | 99Wh (27,500mAh); listing claims up to 5 h at a 20W load; recharges via DC, magnetic DC or USB-C (up to 100W via software); USB-C output; pass-through and bypass power; app monitoring; partly metal housing; IP65; 1/4 in. tripod mount | Check price on Amazon (opens in a new tab) |
| PeakDo LinkPower 1 Starlink Mini Battery Pack (99Wh) | 99Wh (27,500mAh); snap-on fit for Starlink Mini only; listing claims up to 4.5 h runtime; USB-C PD input up to 100W (65W by default, 100W via app), 65W USB-C output; pass-through charging; LCD and app; IP65; 1/4 in. tripod hole; 1.42 lb; includes short DC cable and USB-C cable | Check price on Amazon (opens in a new tab) |
| BigBlue POWAFREE 3 Starlink Mini Battery Pack (99Wh) | 99Wh (18V, 5,500mAh; eq. 27,500mAh at 3.6V); listing says over 4 h for Starlink Mini; USB-C up to 100W output and 65W input; recharge via USB-C or DC5521 including 15-30V solar; pass-through; built-in kickstand; LCD with runtime estimate; 1.47 lb (668 g); 18-month warranty | Check price on Amazon (opens in a new tab) |
Specs are from manufacturer and retailer listings and can change between versions; check the listing before you buy. We don't show prices because they change often; the button shows the current price on Amazon.
PeakDo LinkPower 2 Starlink Mini Battery Pack (99Wh)
99Wh (27,500mAh); listing claims up to 5 h at a 20W load; recharges via DC, magnetic DC or USB-C (up to 100W via software); USB-C output; pass-through and bypass power; app monitoring; partly metal housing; IP65; 1/4 in. tripod mount
Pros
- Three ways to recharge, including magnetic DC for vehicles
- Bypass mode can feed the Mini directly from external power
- Metal heat-sink housing
Cons
- USB-C input is limited to 28V; PeakDo warns not to use the 30V Starlink Mini adapter through a DC-to-USB-C adapter
- Runtime claim is at a light 20W load
The clearest bypass description of the three. It also accepts magnetic DC charging, which is handy when you connect and disconnect vehicle power often.
PeakDo LinkPower 1 Starlink Mini Battery Pack (99Wh)
99Wh (27,500mAh); snap-on fit for Starlink Mini only; listing claims up to 4.5 h runtime; USB-C PD input up to 100W (65W by default, 100W via app), 65W USB-C output; pass-through charging; LCD and app; IP65; 1/4 in. tripod hole; 1.42 lb; includes short DC cable and USB-C cable
Pros
- Clips onto the Mini, no loose cables
- Powers the Mini over its DC lead, so no 100W USB-C needed
- 99Wh stays under the common 100Wh airline limit
Cons
- Fits Starlink Mini only
- 100W USB-C input must be enabled in the app
PeakDo lists pass-through charging and a USB-C PD input up to 100W when enabled in the app. Use the higher input so the charger can keep up with the dish.
BigBlue POWAFREE 3 Starlink Mini Battery Pack (99Wh)
99Wh (18V, 5,500mAh; eq. 27,500mAh at 3.6V); listing says over 4 h for Starlink Mini; USB-C up to 100W output and 65W input; recharge via USB-C or DC5521 including 15-30V solar; pass-through; built-in kickstand; LCD with runtime estimate; 1.47 lb (668 g); 18-month warranty
Pros
- Accepts 15-30V solar input directly
- Built-in kickstand stands the Mini upright
- Display shows estimated remaining runtime
Cons
- USB-C input is 65W, slower than 100W rivals
- Designed around the Mini, less useful as a general power bank
BigBlue lists pass-through and a DC input that accepts 15 to 30V, including solar. Its runtime display shows whether the pack is gaining or losing while connected.
Will the battery actually gain charge?
Only if the charger supplies more than the dish takes. Suppose the Mini is drawing 35W and the pack's USB-C input is running at 45W. After conversion losses, only a few watts are left for the cells, so it charges very slowly. On a 65W input with the Mini working hard, the pack might barely hold steady. On a 100W input, it will refill while running the dish.
| Charger input | Mini draw | Net result (rough) |
|---|---|---|
| 30W | 25 to 40W | Pack still drains |
| 65W | 25 to 40W | Slow gain or hold |
| 100W | 25 to 40W | Steady gain |
These are illustrations, not measurements. Your pack's display will tell you the real story.
How to test a pack
- Charge it to about half. Behaviour can differ near full and near empty, and half-charged is the most realistic.
- Get the Mini online from the battery alone, and open the Starlink app.
- Plug in the charger. Watch the app. Does the connection survive? Does the dish restart?
- Wait ten minutes and check the pack's display to see whether it is gaining.
- Unplug the charger. Watch again for a restart.
- Repeat near full charge. Some packs change behaviour when the cells reach 100 percent.
Where pass-through matters most
- Vehicles. Power comes and goes with the ignition. A seamless pack turns a car socket into an uninterrupted supply. See our 12V car setup guide.
- Home backup. The whole point is surviving an outage. Our power cut guide builds on this.
- Solar. Panel output varies constantly. The pack has to buffer without resetting.
Battery health
Keeping a lithium pack permanently at 100 percent and warm is hard on it. Bypass designs help, and some packs let you set a charge limit in an app. If yours does, a lower ceiling such as 80 percent can extend its life when it lives on a charger. Keep it out of direct sun and away from the hot back of the dish on summer days.
FAQ
Does every Mini battery support pass-through?
No. Many do, but check the listing, and test it yourself because behaviour varies.
Is pass-through bad for the battery?
Constant small cycles at high charge and heat do wear cells faster. Bypass modes and charge limits reduce that.
Why does my Mini reboot when I start the car?
Starting the engine briefly drops the 12V supply, and the pack may reset its output when input changes. A seamless pack or bypass mode helps.
Can I use pass-through with solar?
Yes, if the pack accepts solar input. Make sure the panel voltage is within the input range.
Do I need a 100W charger for pass-through?
Not strictly, but anything lower may not keep up with the dish, so the pack drains slowly anyway.