{"product_id":"epson-r-d1-replacement-battery-37v-2400mah-li-ion","title":"Epson R-D1 Replacement Battery 3.7V 2400mAh Li-ion","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eEpson R-D1 \/ R-D1s — 3.7V Li-ion Replacement Battery (B32B818232)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis 3.7V Li-ion cell replaces the OEM battery in the Epson R-D1 and R-D1s rangefinder digital cameras. Capacity is 2400mAh (8.88Wh), matching the original cell's power envelope for the camera's sensor, image processor, and LCD. It also covers OEM part numbers B32B818233, EPALB1, and EU-85.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eR-D1 and R-D1s compatibility:\u003c\/strong\u003e\n    Both models share the same battery bay geometry, connector pinout, and BMS communication protocol. A single cell works across both bodies without 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 R-D1 hardware. The BMS accepted the cell, reported charge state correctly, and thermal protection tripped as expected under simulated overload — no runaway.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eFirst-install charge cycle on the R-D1:\u003c\/strong\u003e\n    Run the new cell through one full charge inside the camera body or OEM charger before heavy shooting. The R-D1's BMS maps the battery-remaining indicator to the cell's discharge curve during this first cycle — skipping it causes erratic percentage readings during your next session.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eWhy the R-D1 shows a dead-battery indicator on a partially charged replacement cell\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThe R-D1's battery gauge reads voltage thresholds, not raw capacity. A new replacement cell has a slightly different internal resistance than the aged OEM cell the camera calibrated against. Under the brief current spike of sensor readout or LCD backlight activation, voltage dips past the camera's low-battery threshold even when the cell is 60–70% full. One full charge-discharge cycle inside the camera body lets the BMS recalibrate its voltage-to-capacity map to the new cell's characteristics.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eBattery percentage jumping erratically mid-shoot\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eA replacement cell's discharge curve doesn't always match the lookup table stored in the R-D1's firmware. The camera samples terminal voltage at intervals and converts that reading to a percentage — if the new cell's voltage sits between two calibration points, the displayed number jumps. This is a firmware mapping issue, not a fault with the cell. Charge the battery to 100% via the OEM charger, then drain it fully through normal shooting to let the BMS resync its reference points — the display should stabilise from the next full charge onward.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43333577277530,"sku":"BWCS-RDB200FU-1","price":43.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43333577310298,"sku":"BWCS-RDB200FU-2","price":50.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43333577343066,"sku":"BWCS-RDB200FU-3","price":55.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-RDB200FU-1.webp?v=1778212955","url":"https:\/\/batteryweb.com\/products\/epson-r-d1-replacement-battery-37v-2400mah-li-ion","provider":"BatteryWeb","version":"1.0","type":"link"}