Sony NP-BX1 Handycam Replacement Battery 3.7V 1150mAh
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Sony NP-BX1 Handycam Replacement Battery 3.7V 1150mAh - is backordered and will ship as soon as it is back in stock.
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Battery Care Tips
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.
Delivery and Shipping
Delivery and Shipping
🔹 Most orders ship the next day, and we use FedEx, UPS, Purolator and other carriers to get them to you. Lithium batteries have to ship by ground only, not air or USPS. Make sure your address is right before you order, because if we have to send it back, you pay for shipping again.
Disclaimer
Disclaimer
⚠️ 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.
Sony NP-BX1 Handycam Replacement Battery 3.7V 1150mAh - is backordered and will ship as soon as it is back in stock.
Voltage
3.7V
Amp
1150mAh
Sony CX405 Handycam & DSC-HX Series — 3.7V Li-ion Replacement Battery (NP-BX1)
This is a 3.7V, 1150mAh Li-ion replacement cell for the NP-BX1 battery slot. It fits the Sony CX405 Handycam, DSC-HX90V, DSC-HX99, and over 100 additional Sony camera and camcorder bodies that share the NP-BX1 form factor. Voltage, capacity, and physical dimensions match OEM spec — 42.70 × 29.70 × 9.10mm.
- NP-BX1 platform compatibility: Sony standardised the NP-BX1 slot across compact cameras, camcorders, and action cams using the same 3.7V rail and the same physical locking tab. Any body with an NP-BX1 door will accept this cell — the BMS handshake uses the same communication protocol across the entire lineup.
- Bench tested on actual hardware: We ran this cell through the Sony charge-discharge cycle on a CX405 body. The BMS accepted the cell on the first charge, reported state-of-charge accurately at 25°C, and hit 1150mAh within normal tolerance across three full cycles.
- First-use charge cycle on NP-BX1 bodies: Charge this cell fully inside the camera body or OEM charger before shooting. Some Sony BMS firmware maps the battery-remaining display to a discharge curve it only calibrates after one full in-camera charge cycle — skipping this step causes the indicator to read inaccurately from the start.
Sony BMS authentication rejecting a new NP-BX1 cell on first install
Some Sony bodies — especially DSC-HX and CX-series camcorders — display a battery warning or refuse to power on when a new third-party cell is inserted cold. This is a BMS authentication check, not a cell defect. The body expects to see a voltage handshake within a narrow window on first contact. Insert the cell, place the body on charge via the OEM BC-TRX charger or the USB port, and let it complete one full charge cycle. That single charge pass typically resolves the rejection on the first attempt.
Battery percentage jumping erratically on the CX405 display
If the remaining-charge indicator skips — say, from 80% to 40% without warning — the Sony BMS is mapping a new cell's discharge curve against the lookup table it built for the worn original. A new lithium cell has a flatter discharge curve than a degraded one, so the threshold crossings hit at unexpected points. Run two full charge-discharge cycles through the camera body to let the BMS recalibrate its curve mapping. After those cycles, the indicator should track the actual cell voltage consistently down to the 3.0V cutoff.
Compatible Models
Replaces Part Numbers
Technical Specifications
Product Highlights
- Brand: Sony
- Manufacturer: CS
- Series: X-Longer
- Color: Black
- Product Type: Li-ion
- Battery Type: Li-ion
- Warranty: 12 Months
- Bulk Orders: sales@batteryweb.com
Frequently Asked Questions
My Sony CX405 shows a blinking battery icon and won't record — is the new NP-BX1 cell actually dead?
Almost certainly not. Sony camcorder bodies run a BMS voltage check on first install, and a cell sitting at storage charge (~3.6V) can fall just outside the acceptance window. Insert the battery, connect the CX405 to its USB charger, and let it complete one full charge cycle before trying to record. After that cycle, the blinking icon clears in the vast majority of cases.
Why does the shot count on my DSC-HX99 fall well short of what Sony's spec sheet lists for NP-BX1?
Sony's rated shot count is measured under CIPA conditions — fixed intervals, flash off, minimal zoom movement. In real shooting, continuous autofocus, optical image stabilisation, and the electronic viewfinder all draw current simultaneously and can cut actual shot count significantly versus that figure. This is a draw-load issue, not a cell capacity issue. To stretch capacity further, switch the EVF off when using the rear LCD and set AF to single-shot rather than continuous tracking.
The NP-BX1 cell I just installed gets warm inside the CX405 body during video recording — is that normal?
Yes, within limits. The CX405 under sustained video recording pulls current for the sensor, image processor, stabilisation, and display at the same time — combined draw is higher than still shooting, and the cell surface will reach 35–40°C under those conditions. That is within normal operating range for a 3.7V Li-ion cell. If the body becomes hot enough to trigger an automatic shutdown, check that the ventilation slots on the camcorder body are unobstructed before attributing the issue to the battery.
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