Short answer: at 1020mAh per FW50, carry two batteries for a half day of city shooting, three for a full day outdoors, four for a two- to three-day trip, and for a week or more plan “days plus one” but rarely more than five, since the DR-FW50 dual case can refill them every night. The variable that matters is not trip length but whether you get reliable socket time each day. Anywhere you can charge overnight, the number you need drops fast.
Many people pack extra and come home with two batteries still sealed. The right approach is to size for your worst day and add one spare, not to multiply by total days.
Start with consumption: think in days, not frames
The FW50 is a small battery; on an A6xxx body one roughly covers 300 to 400 stills, or 50 to 70 minutes of video. Travel shooting has a particular pattern — few frames, long power-on time — so standby draw is a large share, and converting from frame counts alone will underestimate use.
| Trip type | Rough daily use | Carry | Reasoning |
|---|---|---|---|
| Half day of street shooting | Just over one battery | 2 | Swap when one dies, charge back at the hotel |
| Full day outdoors, evening included | 2 batteries | 3 | One in reserve for an unplanned extra shoot |
| Two- to three-day trip | 2 batteries a day | 4 | Rotate in pairs; the case fills two each night |
| A week or more | 1.5-2 batteries a day | 4-5 | No need to scale linearly with days |
| Video-heavy | 1 battery per 40 minutes | 5 and up | High draw, and no window to recharge |
The last row follows different logic from the others. When shooting video the camera runs continuously for long stretches with no chance to swap out and charge, so the batteries have to carry the whole session. Planning on one and a half per hour is the safer estimate. If the day involves interviews or event coverage that cannot be interrupted, err toward the top of the range.
The case solves management, not just charging
Four loose batteries sounds like a minor inconvenience. In practice it means digging around the bag, losing track of which are full, contacts knocking against keys and coins, and hunting for a cable per battery back at the hotel. The DR-FW50 gathers all of it into a hard shell; closed, it becomes a single battery module about the size of a cigarette pack.
Status tracking matters more. Agree on one simple rule: full batteries go in with the terminals facing up, spent ones facing down. Open the case and you can see at a glance how many are usable without fitting each one into the camera to test. That habit beats any label.
It also removes the charging queue. Back at the hotel, two batteries go into the case and one cable goes in the wall; by morning both are full. Whichever battery is left over tops up from a power bank through the TNP-FW50’s direct-charge port. With both paths running at once, four batteries can be ready in a single evening.
Packing it: three positions
The case is a flat rectangle, which makes it easier to place than bare batteries. These three spots are ordered by how often you reach for it.
- Top-lid pocket or front pocket of the camera bag. Fastest access, and you can swap a battery without taking the bag off. Keep it away from hard items like tripod plates and quick-release plates.
- A divider slot in the main compartment. Wall off a small cell with dividers and slide the case in upright; it takes no lens space and will not roll around.
- A small shoulder bag or coat pocket. Good for one-day trips with two batteries, and in cold weather your body heat keeps them warmer, which helps.
Places to avoid: the very bottom of the pack against your back, where access means unpacking everything; checked luggage, since lithium batteries should not be checked; and a car’s center console in summer, where heat accelerates aging.
Security checks and flying
Lithium batteries must travel in the cabin, not in checked baggage — that is the general rule. A single FW50 is only 7.7Wh, far below the common 100Wh limit, so carrying several is usually uneventful. At security, pulling the case out of your bag as one unit is easier to explain than loose batteries: it is a finished product, not a pile of bare cells.
For the finer points and how airlines differ in enforcement, see the guide to carrying lithium batteries on flights; the FW50 and FZ100 fall under the same capacity thresholds. Contact protection is worth noting too: the bays enclose the terminals, which is another reason the case is easier to travel with than loose batteries.
Combining case charging with direct charging
The two methods serve different purposes. Case charging suits anywhere you have a fixed base: two batteries at once, no supervision. Direct charging suits time on the move: one battery on a power bank, topping up as you walk.
The split I recommend is case charging at your accommodation in the evening, direct charging at cafés, stations and restaurants during the day. Even if you fail to find a socket one night, the power bank keeps you running the next day instead of starting empty.
If you do not yet own a direct-charge battery, start with the TNP-FW50 body compatibility and charging notes; if you only want a storage-and-charging setup for the batteries you already have, the DR-FW50 category page has the fuller specifications.
FAQ
Are two batteries enough for a week-long trip?
If you can recharge every night, yes. Rotate the two and charge both each evening and both are full by morning. The risk is a night with poor accommodation and no socket, so bring at least one battery that supports direct charging as redundancy.
Can batteries go in checked luggage?
No. Lithium batteries should stay with you in the cabin. The case can go in your carry-on, and passing it through security alongside your laptop makes the process smoother.
Do batteries need special handling in winter?
Yes. Usable capacity drops noticeably in the cold, so keep spares in an inside pocket rather than the outer pocket of the camera bag. After shooting, do not bring them straight from the cold into a warm, humid room; let them come back to room temperature before opening the case.
Can the case charge a phone like a power bank?
No. It is a charging case that needs an external supply, holds no charge of its own, and has no USB output. Bring a separate power bank for your phone.