{"product_id":"blaupunkt-ax-77-replacement-battery-6v-4200mah-ni-mh","title":"Blaupunkt AX-77 Replacement Battery 6V 4200mAh Ni-MH","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eBlaupunkt AX-77 \/ AX-85 \/ AX-90 \/ AX-120 Series — 6V Ni-MH 4200mAh Replacement Battery\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is a 6V, 4200mAh Ni-MH replacement battery for the Blaupunkt AX-77 and related film camera models including the AX-85, AX-90, and AX-120. It powers both the camera mechanics and flash circuitry. Capacity is 25.2Wh, matching the original cell specification for this camera series.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eAX-77 \/ AX-85 \/ AX-90 \/ AX-120 platform fit:\u003c\/strong\u003e\n    These models share the same 6V power rail, connector footprint, and BMS handshake protocol, so one cell covers the full range. Swapping between these bodies does not require a reconfiguration step.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We ran this cell through charge and discharge cycles on camera hardware at 6V nominal. The BMS accepted the cell without fault flags, and flash capacitor recharge current remained stable across repeated charge states.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eFirst-cycle charge procedure for this camera series:\u003c\/strong\u003e\n    Insert the cell and run one full charge cycle through the camera body or OEM charger before heavy shooting. The BMS on these Blaupunkt bodies maps the battery-remaining indicator to the discharge curve during that first cycle — skipping it causes erratic percentage readings from the start.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eFlash output dropping mid-shoot on a new AX-series battery\u003c\/h3\u003e\n\n  \u003cp class=\"bpw-desc-p\"\u003eThe AX-77 flash capacitor draws a sharp recharge current spike after each exposure. If the cell has not completed a full conditioning cycle, the BMS can read the open-circuit voltage as higher than the loaded voltage, delivering less current to the capacitor than needed. This causes the flash to recycle slowly or fire at reduced output. The fix is completing one full charge-discharge cycle in the camera body so the BMS recalibrates its internal voltage map to the actual cell curve.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eBattery percentage jumping erratically on the AX-77 display\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eNi-MH cells have a flatter discharge curve than Ni-Cd, and the AX-series indicator is calibrated to a voltage threshold map. A new cell discharged for the first time does not match the stored curve in the camera BMS, so the indicator jumps between readings. This is not a fault in the cell. Run the battery down fully once and recharge completely through the camera body. After that cycle, the percentage display tracks the actual charge state correctly at 6V nominal.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43333900304474,"sku":"BWCS-NP66-1","price":50.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43333900337242,"sku":"BWCS-NP66-2","price":58.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43333900370010,"sku":"BWCS-NP66-3","price":64.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-NP66_1.webp?v=1778213590","url":"https:\/\/batteryweb.com\/products\/blaupunkt-ax-77-replacement-battery-6v-4200mah-ni-mh","provider":"BatteryWeb","version":"1.0","type":"link"}