{"product_id":"sony-fdr-ax40-replacement-battery-73v-1600mah-li-ion","title":"Sony NP-FV50A Camcorder Replacement Battery 7.3V 1600mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eSony FDR-AX40 \/ FDR-AX45 Series — 7.3V Li-ion Replacement Battery (NP-FV50A)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is a 7.3V, 1600mAh Li-ion replacement for the Sony NP-FV50A battery pack. It fits the FDR-AX40, FDR-AX45, FDR-AX60, HDR-CX625, and nine additional Sony camcorder models. Slot it in exactly where the original sits — same connector, same form factor.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eFDR-AX and HDR-CX platform fit:\u003c\/strong\u003e\n    These Sony camcorder lines share a common NP-FV series battery bay, the same 7.3V rail, and an identical multi-pin InfoLITHIUM connector. That connector carries bidirectional data between cell and body — the BMS reads charge state and cell ID through the same pins that deliver power.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We ran this cell through the FDR-AX40 body, cycling charge and discharge while monitoring the InfoLITHIUM communication handshake. The BMS accepted the cell on first install and reported charge level without triggering the incompatible-battery warning.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eFirst charge cycle on the FDR-AX40:\u003c\/strong\u003e\n    Perform the initial full charge inside the camera body rather than a standalone charger. The FDR-AX40's InfoLITHIUM system calibrates its battery-remaining display during that first in-body charge cycle — skipping this step can cause the indicator to read inaccurately for the first several uses.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eSony InfoLITHIUM handshake rejection on third-party cells\u003c\/h3\u003e\n\n  \u003cp class=\"bpw-desc-p\"\u003eSony's InfoLITHIUM system does more than deliver power — it exchanges digital data on cell temperature, charge history, and identity through the multi-pin connector. A replacement cell that doesn't mirror the expected data packet triggers a \"cannot use this battery pack\" warning on screen. This happens most often when the cell is inserted into a cold body or after the camera firmware was recently updated. The fix is to charge the replacement cell fully inside the camera body first, which re-initialises the handshake sequence. After one complete in-body charge cycle, the warning clears and the battery-remaining indicator tracks normally.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eBattery percentage jumping erratically on the FDR-AX40 display\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThe FDR-AX40's fuel gauge maps voltage thresholds to percentage steps calibrated around Sony's original NP-FV50A discharge curve. A new replacement cell — even a correctly spec'd one — can read differently at each voltage step until the camera logs a few complete cycles. You'll see the indicator drop from 80% to 55% in seconds, then stall for a long stretch. Run two or three full charge-to-discharge cycles through the camera body. By the third cycle, the voltage-to-percentage mapping stabilises. If it hasn't settled after three cycles, check that the multi-pin connector is seated flush — even a 0.5mm gap interrupts the data line and causes erratic readings.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43333628788826,"sku":"BWCS-SDX500MC-1","price":20.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43333628821594,"sku":"BWCS-SDX500MC-2","price":21.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43333628854362,"sku":"BWCS-SDX500MC-3","price":23.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-SDX500MC-1.webp?v=1778212994","url":"https:\/\/batteryweb.com\/products\/sony-fdr-ax40-replacement-battery-73v-1600mah-li-ion","provider":"BatteryWeb","version":"1.0","type":"link"}