{"product_id":"grundig-46405-replacement-battery-6v-4200mah-ni-mh","title":"Grundig 46405 6V Ni-MH Replacement Battery 4200mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eGrundig 46405 \/ 46406 \/ 46407 Series — 6V Ni-MH Replacement Battery\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is a 6V 4200mAh Ni-MH replacement battery for Grundig cameras including the 46405, 46406, 46407, and BP-8-1, plus over 70 compatible models. It slots into the same battery bay as the original cell and connects via the same terminal arrangement. Capacity is rated at 4200mAh (25.2Wh), matching the stock specification.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003e46405 \/ 46406 \/ 46407 platform fit:\u003c\/strong\u003e\n    These Grundig camera models share the same 6V battery bay, connector pinout, and BMS voltage thresholds — which is why one cell covers the full range. Swapping between models in this family requires no adapter or modification.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We cycled this cell through charge and discharge on a camera body in this series. The BMS accepted the cell without error after one full charge cycle completed from within the camera body, and the battery-remaining indicator tracked correctly through the discharge curve.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eFirst-install charge protocol for Grundig camera bodies:\u003c\/strong\u003e\n    Insert the new cell and run one complete charge cycle through the camera body or the OEM charger before shooting. Some Grundig camera BMS systems use the initial charge cycle to calibrate the battery-remaining display — skipping this step can cause the indicator to read inaccurately from the first session.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eCamera showing dead battery indicator on a partially charged replacement cell\u003c\/h3\u003e\n\n  \u003cp class=\"bpw-desc-p\"\u003eGrundig camera bodies in this series map the battery-remaining display to a voltage threshold table built for the original cell's discharge curve. A new Ni-MH replacement cell can sit at a different resting voltage after shipping, which the BMS reads as critically low even when the cell holds a solid charge. The fix is straightforward: place the cell in the charger and run it to full before the first use. Once the BMS has seen a complete charge cycle, the indicator recalibrates and reads accurately from that point forward.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eBattery percentage jumping erratically during a shoot\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThis happens when the camera's voltage-to-percentage mapping doesn't align cleanly with the new cell's discharge curve — particularly mid-cycle, where Ni-MH cells hold a flatter voltage plateau than the camera firmware expects. The display can jump from 60% to 20% in a few frames as the cell crosses a firmware threshold. Run two full charge-discharge cycles through the camera body to let the BMS learn the actual curve. After conditioning, the percentage readout stabilises and drops more predictably through the session.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43333899255898,"sku":"BWCS-NP66-1","price":50.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43333899288666,"sku":"BWCS-NP66-2","price":58.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43333899321434,"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\/grundig-46405-replacement-battery-6v-4200mah-ni-mh","provider":"BatteryWeb","version":"1.0","type":"link"}