Short answer: the YO TNP-FW50 is an NP-FW50 replacement pack with a USB-C port built into the battery itself, so it charges from a phone charger or power bank with no dock and no camera involved. It keeps the original ratings of 1020mAh / 7.7Wh / 7.2V and fits bodies that use FW50 — the A6000 series, first- and second-generation A7, the A5100, the NEX series and the RX10 among them. Its value is not doubled capacity; it is turning charging from “you must bring a dock” into “one cable is enough”. If your bodies are still in the FW50 world, this pack answers a question about how much you carry, not about how much runtime you get.
What follows covers three things: which bodies can genuinely use it, where it differs from Sony’s own FW50, and how direct charging fits into a real shooting routine.
What it is: cells, a decoding board and a USB-C port
An ordinary FW50 replacement has only positive and negative terminals plus the communication contacts, so charging depends on an external dock or on the body’s USB port — and most FW50-era bodies do not support USB charging at all, let alone charging while shooting. The TNP-FW50 opens a USB-C socket in the side of the shell and adds a charging management circuit inside: 5V comes in, and that circuit handles detection, constant current, constant voltage and the final trickle, all closed inside the pack.
That means the dedicated dock can stay at home. A phone charger, a car adapter, a power bank or a laptop’s USB port — anything that delivers a steady 5V — can in principle top it up. For anyone who travels with one small bag, carrying one less item is a tangible gain.
The output is unchanged, so do not expect more capacity
Output is still 7.2V nominal, identical to the original, so the camera simply sees an FW50. Capacity is likewise in the 1020mAh / 7.7Wh range, which is a small pack. The A6xxx series has always been fairly thirsty, and only later generations eased the problem with a bigger battery, so expectations for FW50 bodies should stay realistic: the point is to carry a spare and recharge one quickly, not to make one pack do the work of two.
Compatibility: confirm your body actually uses FW50
This is where mistakes happen, because Sony ran two battery systems in parallel for a period. The check is simple: open the battery bay and read the marking, or look at whether the original pack says NP-FW50. The table below covers the common bodies.
| Body | Uses FW50 | Notes |
|---|---|---|
| A6000 / A6100 / A6300 / A6400 / A6500 | Yes | Mainstream APS-C bodies, the core FW50 user base |
| A6600 | No, uses NP-FZ100 | Looks close to the A6400 but takes a different battery — do not buy the wrong one |
| ZV-E10 | Yes | Vlogging body, still on FW50 |
| A5000 / A5100 | Yes | Entry bodies with lower draw |
| A7 / A7 II | Yes | First- and second-generation full frame |
| A7 III and later, A7R III and later | No, uses NP-FZ100 | The battery system changed from the third generation |
| NEX-5 / NEX-6 / NEX-7 series | Yes | Older bodies; compatibility is covered in a separate article |
| RX10 series | Most models | The label in the battery bay is the authority |
The one entry worth flagging is the A6600: it looks like the A6400 and sits close to it in the range, but it takes FZ100, so an FW50 will not go in. Conversely, the A6100, A6300, A6400 and A6500 are all standard FW50 bodies and safe to use. A fuller breakdown is in the NP-FW50 battery section.
How it differs from the OEM FW50: four points
Listing the differences is more useful than saying “compatible” in general terms. These four are the ones you will actually notice.
- Charging method: the original needs a dock or a specific in-body USB arrangement; the TNP-FW50 charges on its own. This is the core difference, and the only one firmware cannot close.
- Capacity: both are in the 1020mAh class, so there is no generational jump. Do not believe claims of increased capacity — the physical volume is what it is.
- Decoding and messages: third-party packs rely on compatible decoding to talk to the body, and most cameras recognize them and show a percentage. Some older firmware may show a “not a genuine battery” message, which does not affect use.
- Price and warranty: clearly cheaper than OEM, but the warranty runs through the third-party channel rather than Sony’s service network.
In other words, if what you want is no message at all and zero difference from the original, only the original delivers that. If you can accept one message in exchange for leaving the dock at home, the TNP-FW50 is a reasonable choice.
Charging rhythm: 5V input, around two hours
Because it is a small pack, fill times are generally shorter than for FZ100-class batteries. On 5V input with an ordinary 5V/1A charger, empty to full usually falls in the 2 to 3 hour range; a 5V/2A charger is noticeably quicker at roughly 1.5 to 2 hours. No fixed figure is given here because the real time depends on the charger’s actual output, cable drop and the pack’s current state of charge, and shallow top-ups are quicker.
In practice: between setups, take the pack out of the bag and plug it into a power bank, and half an hour returns a fair amount of charge — more flexible than waiting for a dock to finish. The time differences between input levels are set out in the TNP-FW50 charging and compatibility section.
Who should buy one
Three groups gain most: people with several FW50 bodies who want one charging method across all of them; travelers and location shooters short on luggage space who would rather not pack another power supply for a dock; and anyone using an A6000-series body as a backup, time-lapse or monitoring camera that needs repeated top-ups over long periods. Conversely, if you only shoot in a studio where a dock is always within reach, the marginal benefit of direct charging is much smaller.
If you need to charge two packs at once and want them stored tidily, that is a different product line — see the DR-FW50 dual-slot charging case. Packs and cases complement each other rather than replacing each other.
FAQ
Will a TNP-FW50 fit the A6600?
No. The A6600 takes NP-FZ100, with different dimensions and contacts. The A6100, A6300, A6400, A6500 and ZV-E10 are the FW50 bodies.
Can it be charged while inside the camera?
Not advisable. The charging port is on the pack itself and the pack has to come out and connect to a supply; the camera plays no part. That is also safer, since charging heat is not added inside the body.
Will it show a battery percentage?
Most bodies show it normally, either as bars or as a percentage, depending on how well the firmware recognizes third-party decoding. Some older firmware may first show a “not a genuine battery” message, after which everything works.
How many frames will one pack give?
At 1020mAh and A6400-class draw, ordinary shooting lands around 300 to 400 frames, with real results varying widely with burst use, finder choice, screen brightness and whether you shoot video. Per-model runtime estimates are collected in the TNP-FW50 model guide.