Whether to fit a fresh NP-FZ100 before selling a used camera comes down to the health of the one you have. If it is clearly tired — noticeably shorter than a new cell, or dropping bars in jumps — a new cell usually lifts both your closing rate and the buyer’s review. If it still performs, describing it honestly and pricing accordingly is the better deal. The NP-FZ100 is rated 2280mAh / 7.2V / around 16.4Wh and official CIPA figures generally sit in the 500–700 frame range. Buyers know that number, so a cell that comfortably delivers several hundred frames on a charge is itself evidence the camera was looked after.
What the battery does in a used sale
- It is the one consumable a buyer can test on the spot: shutter counts can be massaged and scuffs can be shot around, but a cell tells the truth in a minute.
- It sets the first impression: a camera that will not power on at a meetup pushes the buyer’s number down immediately.
- It reads as maintenance history: clean contacts and a shell that is not swollen suggest the whole body was cared for.
- It is cheap relative to the body: a compatible cell runs around $17.89, a small fraction of what the camera is worth, and it buys trust.
When to swap
| Symptom | Reads as | What to do |
|---|---|---|
| Won’t last half a day of hard shooting from full | Clear capacity loss | Swap, or disclose and drop the price |
| Jumps from two bars straight to shutdown | Gauge or internal resistance problem | Swap |
| Charges much faster than normal | Less capacity going in | Swap |
| Swollen shell, oxidized contacts | Safety issue | Stop using it and replace it — do not ship it with the camera |
| Normal runtime, cosmetic wear only | Healthy | Clean it and sell as is |
Note the safety line: a swollen cell should not be charged or discharged, and should not be handed over as a freebie. Route it to a household hazardous waste or battery recycling point — the steps are in handling a swollen NP-FZ100 safely.
The economics of a swap
The math takes two lines: what a cell costs, and what it is worth in negotiation.
- Cost side: around $17.89 per cell, around $22.93 for a cell plus charger, around $36.74 for two cells with a charger. For reference, an original Sony NP-FZ100 usually runs $70 and up through official channels.
- Upside: buyers routinely knock money off for a battery that obviously will not last, and that discount often exceeds the cost of a cell. A body listed with a fresh cell also tends to sell faster, which saves listing time.
- The alternative: state the condition plainly — “battery has aged, replace if it bothers you” — and price it in. That works better on older, lower-value bodies.
In short, swap on mid-range and high-end bodies (A7 IV, A7R V, A9 series, A1) where expectations run high. For entry-level or long-discontinued models, disclosure plus a lower price is more practical. Per-body runtime figures are collected in the NP-FZ100 runtime database.
Not swapping? Make the battery’s condition a selling point
Most buyers are not bothered by an aged cell. They are bothered by not being told. Put these in the listing and credibility goes up:
- Purchase date and usage: “bought in 2023, used about once a week.”
- What it does now: give a real scenario, such as “roughly 300–400 frames per charge shooting through the viewfinder.”
- Any non-original battery messages: if a compatible cell is fitted, say what the body displays.
- Willingness to hand over fully charged: offering that is itself a plus.
- Whether a charger is included: a charger is usually more welcome than another old cell.
Some Sony bodies show a message that remaining charge may not display accurately with a non-original cell. That is normal and shooting continues. If you are shipping a compatible cell with the camera, mention it up front to avoid a misunderstanding later.
Pre-sale checklist
- Wipe the cell contacts and the body’s terminals with a dry cloth or a soft eraser until they are clean and unoxidized.
- Check the shell for swelling. Any bulge and the cell is done.
- Run one full charge cycle and confirm charging and the charger’s indicator behave normally.
- Shoot a short set and note start and end charge levels, so you can describe runtime to buyers.
- Photograph the label closely, with model, capacity and origin legible.
- Put the cell’s condition in the description rather than hiding it.
- State exactly what ships: one cell or two, and whether a charger is included.
The buyer’s side of the same checklist is in should you replace the battery on a used A7 III — both sides are working from the same criteria.
FAQ
Do buyers mind a compatible (third-party) cell?
Most care only that it works. Third-party cells are a legitimate alternative; as long as the capacity is real and the body recognizes it, saying so is enough. Note the brand and capacity in the listing to prevent confusion.
Is shipping a compatible cell with the camera misleading?
Not if you label it as compatible rather than original. Never describe a third-party cell as “genuine” — that is basic honesty in a transaction.
What is an original cell worth on its own?
It depends on health; a tired one rarely brings much. Leaving it in the camera as “original cell included” usually does more for the listing than selling it separately.
A camera sat unused for years and the cell will not charge. What now?
Long-term storage wants roughly 40%–60% charge with a top-up every three months. A cell that has gone fully flat may have entered protection; check before doing anything else — the troubleshooting sequence is in our “NP-FZ100 will not charge” guide.
If you want the camera to ship with a healthy cell, our NP-FZ100 compatible battery is rated 2280mAh / 7.2V / around 16.4Wh at around $17.89 per cell, around $22.93 for one cell with a charger and around $36.74 for two cells with a charger. For more capacity, the TNP-FZ100 (2400mAh / around 17.3Wh) runs around $19.66, $24.70 and $39.92. Used-gear dealers and refurbishers fitting batteries across many bodies should use the wholesale inquiry page — bulk orders are quoted case by case.