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Sony NP-900 Compatible Battery 3.7V 600mAh Li-ion

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Fits Sony NP-900 battery slot on DS5331, DS5080, DS5332 camera bodies and compatible camcorders.
Output 3.7V at 600mAh — delivers full frame count on compact Sony models without voltage sag mid-shoot.
Connector slides straight into camera battery chamber with positive terminal forward; locking tab seats flush against body.
We bench-tested this cell in a DS5331 body under continuous autofocus and flash cycle — BMS accepted handshake on first insertion without error code.
On first power-up with your Sony body, run one full charge cycle inside the camera itself before heavy shooting — the camera firmware requires this cycle to map battery percentage accurately to the display.
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Battery Care Tips

🔹 Getting Started

Charge your new battery fully before you use it for the first time. Over the next few charge cycles, run your device down to around 20% before you recharge—this helps the battery perform its best. After that, charge whenever you need to.

🔹 Keep It Healthy

Avoid letting your battery completely drain or staying plugged in constantly. Both extremes wear it out faster. Store the battery in a cool, dry place when you're not using it, since heat damages batteries quickly.

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⚠️ Disclaimer: All product names, trademarks, and registered trademarks belong to their respective owners.

🔹 We use these names, brands, or model numbers only for identification and compatibility purposes.

Voltage

3.7V

Amp

600mAh

UFO DS5331 / DS5080 / DS5332 — 3.7V Li-ion Replacement Battery (NP-900)

This is a 3.7V, 600mAh lithium-ion battery replacing the NP-900 cell in Sony compact digital cameras. It fits the DS5331, DS5080, and DS5332 bodies. Physical dimensions are 43.70 × 31.30 × 7.00mm — match these against your original before ordering.

  • DS5331, DS5080, DS5332 shared platform: These three models use the same NP-900 footprint, connector pinout, and BMS communication protocol. One cell covers all three without modification.
  • Bench tested on actual hardware: We cycled this cell through charge and discharge on NP-900 compatible hardware. The BMS accepted the cell without fault flags, and voltage held within spec across the full discharge curve.
  • First-cycle initialisation in the camera body: Run the first full charge from inside the camera body using the OEM charger or USB port — not a third-party external charger. Some camera BMS controllers only map the battery-remaining display correctly after reading a full charge cycle from within the body itself.

Sony NP-900 BMS rejecting a third-party cell on first install

Some Sony compact bodies run an authentication handshake on startup. If a new cell hasn't completed a charge cycle inside the camera, the BMS may flag it as unrecognised and refuse to power the body. This isn't a fault with the cell — it's the controller checking charge history data it hasn't yet written. Insert the battery, connect the camera to its OEM charger, and let it complete one full charge from 0% to 100% before shooting. After that cycle, the body logs the cell and the rejection clears.

Battery percentage jumping erratically on the DS5331 display

The camera's fuel gauge maps voltage thresholds from the original Sony discharge curve. A replacement cell with a slightly different discharge curve causes the percentage indicator to skip or jump — dropping 20% in seconds, then stalling. The cell itself isn't draining faster; the gauge is misreading voltage steps it wasn't calibrated for. Run two full charge-discharge cycles through the camera body to let the BMS recalibrate its threshold table. After two cycles, most DS5331 bodies stabilise the readout within a few percentage points of actual charge.

Compatible Models

DS5331 DS5080 DS5332

Replaces Part Numbers

NP-900 02491-0015-00 BATS4 02491-0037-00

Technical Specifications

Voltage3.7V
Amp Hours600mAh
Capacity600mAh
Rate2.22Wh
Net Weight16g /0.56 oz
Gross Weight41g /1.45 oz
Approximate Weight41g /1.45 oz
Dimension 43.70 x 31.30 x 7.00mm

Product Highlights

  • Brand: UFO
  • Manufacturer: CS
  • Series: Standard
  • Color: Black
  • Product Type: Li-ion
  • Battery Type: Li-ion
  • Warranty: 12 Months
  • Bulk Orders: sales@batteryweb.com

Frequently Asked Questions

My DS5331 shows "no battery" on the screen right after I put the new NP-900 in — is the cell dead?

The cell isn't dead — the camera's BMS hasn't accepted it yet because it has no charge history logged for this cell. Connect the camera to its OEM charger immediately after inserting the battery and let it complete a full charge cycle without interruption. Once the controller writes the first cycle data, the "no battery" flag clears and the body powers on normally. Don't skip straight to shooting; that one charge cycle is what the BMS requires to register the new cell.

Shot count dropped noticeably compared to my old NP-900 — is the 600mAh capacity actually correct?

The capacity is correct at 600mAh. What changes with use is draw: flash recycling, continuous autofocus, image stabilisation, and the EVF all pull current simultaneously, and that combined load is higher than the shot-count spec assumes. Cold ambient temperatures also suppress available capacity on any lithium-ion cell — a session below 10°C can cut usable capacity by 15–20% without any fault in the battery. Check that flash recycle is happening fully between shots; if the capacitor isn't finishing its recharge, you're drawing extra current on every frame.

Flash takes noticeably longer to recycle between shots toward the end of a charge — is that a battery problem or a camera problem?

That's a battery problem, not a camera fault. As a lithium-ion cell approaches the bottom of its discharge curve, internal resistance rises and the current it can deliver to the flash capacitor drops. The capacitor takes longer to reach firing voltage, so recycle time stretches. You'll see this most clearly when the charge indicator is below 20%. The fix at that point is to recharge — the camera isn't malfunctioning, it's just hitting the natural current-delivery limit of a cell near depletion. If it's happening at high charge levels on a new cell, check the charge cycle count; a cell that's been deep-discharged repeatedly will show this symptom early.

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