{"product_id":"seiko-mp-b20-replacement-battery-37v-3350mah-li-ion","title":"Seiko MP-B20 Portable Printer Compatible Battery 3.7V 3350mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eSeiko MP-B20 — 3.7V Li-ion Replacement Battery (IS496)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis 3.7V, 3350mAh Li-ion battery is a direct replacement for the Seiko MP-B20 portable thermal printer. It fits the compact battery bay used in retail, hospitality, and logistics environments where continuous mobile printing is required. OEM cross-references include IS496, BP-B0326-A1, BP-B0326-B1, and 4331304.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eMP-B20 battery bay compatibility:\u003c\/strong\u003e\n    The MP-B20 uses a single-cell 3.7V Li-ion pack with a specific BMS handshake that manages thermal head current draw and paper feed motor spikes. This replacement matches the original connector pinout and communicates correctly with the printer's charge controller.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We ran this cell through charge, discharge, and motor-start cycles on the MP-B20 platform. The BMS handled peak current from the paper feed motor without tripping, and the thermal head maintained consistent voltage throughout the print cycle.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eFirst-deployment print sequence:\u003c\/strong\u003e\n    After installing, charge the battery fully, then print five test receipts before deploying to the field. The MP-B20's BMS updates its current profile during these initial print cycles — skipping this step can cause the printer to flag a low-battery warning even at full charge.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eWhy the MP-B20 drops its Bluetooth connection mid-print job\u003c\/h3\u003e\n\n  \u003cp class=\"bpw-desc-p\"\u003eThe MP-B20 runs both its Bluetooth radio and thermal head from the same 3.7V cell. When battery voltage sags under print load, the radio draws less power from a shrinking headroom and the host device reads that as a dropout. This becomes more frequent as cell capacity fades over charge cycles. A fresh cell with full capacity keeps voltage above the 3.4V floor the radio needs to maintain its connection throughout a print job.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003ePrint output faded or inconsistent on a charged battery\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThe MP-B20's thermal head requires a stable supply voltage to reach the correct print temperature. A degraded cell may read 100% on the status indicator but sag to 3.3V or lower the moment the thermal head fires, producing uneven or washed-out receipts. This is a cell degradation issue, not a paper or head fault. Replace the battery and confirm resting voltage holds above 3.6V after a full charge cycle.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43415990567002,"sku":"BWCS-SDB200XL-1","price":49.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43415990599770,"sku":"BWCS-SDB200XL-2","price":58.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43415990632538,"sku":"BWCS-SDB200XL-3","price":64.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-SDB200XL-1.webp?v=1779758956","url":"https:\/\/batteryweb.com\/products\/seiko-mp-b20-replacement-battery-37v-3350mah-li-ion","provider":"BatteryWeb","version":"1.0","type":"link"}