{"product_id":"seiko-dpu-3445-replacement-battery-74v-2200mah-li-ion","title":"Seiko DPU-3445 Replacement Battery 7.4V 2200mAh BP-3007-A1-E","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eSeiko DPU-3445 — 7.4V Li-ion Replacement Battery (BP-3007-A1-E)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis 7.4V, 2200mAh Li-ion battery replaces the BP-3007-A1-E pack in the Seiko DPU-3445 portable thermal printer. The DPU-3445 is a compact mobile printer used in retail point-of-sale, logistics, and field service applications. It slots into the original battery bay and connects to the same BMS handshake circuit as the factory unit.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eDPU-3445 platform fit:\u003c\/strong\u003e\n    The DPU-3445 uses a 7.4V nominal rail to drive both the thermal print head and the paper feed motor from a single cell pack. This replacement matches that voltage profile exactly, keeping both subsystems within their operating window without triggering the printer's low-voltage protection cutoff.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We ran this cell through the DPU-3445's BMS initialisation cycle and confirmed the protection circuit accepted the pack without fault codes. Discharge curves under simulated print-head load stayed flat through the mid-range before the expected taper toward cutoff.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eFirst-use print calibration:\u003c\/strong\u003e\n    After installing, charge the pack fully, then print five consecutive test receipts before deploying. The paper feed motor draws a short current spike on each feed cycle — running through a calibration sequence confirms the BMS has set the correct current profile for the new cells.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eVoltage sag on the DPU-3445 thermal head during multi-line print bursts\u003c\/h3\u003e\n\n  \u003cp class=\"bpw-desc-p\"\u003eThe DPU-3445 thermal head fires dot rows in rapid sequence during dense barcode or graphic label output. Each burst pulls a short high-current spike from the battery. A degraded or deeply discharged pack can't sustain that current without voltage sagging below the head's operating threshold. When that happens, the printer either skips dot rows or pauses mid-print while the protection circuit recovers. A fresh cell at full charge maintains the voltage rail above 7.0V during these bursts, keeping print output consistent.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eBluetooth connection dropping mid-job on the DPU-3445\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThe DPU-3445's Bluetooth radio shares the same 7.4V supply as the print engine. At low state of charge, the battery's internal resistance rises and voltage sags during print motor activity — that sag is enough to reset the radio module, dropping the wireless connection mid-job. The printer typically re-pairs automatically, but the job data is lost. Keeping the battery above 7.0V resting voltage before a print session prevents the sag from reaching the radio's reset threshold. Charge fully before any wireless-dependent deployment.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43416000528474,"sku":"BWCS-SDP445SL-1","price":35.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43416000561242,"sku":"BWCS-SDP445SL-2","price":41.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43416000594010,"sku":"BWCS-SDP445SL-3","price":45.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-SDP445SL_1.webp?v=1779759122","url":"https:\/\/batteryweb.com\/products\/seiko-dpu-3445-replacement-battery-74v-2200mah-li-ion","provider":"BatteryWeb","version":"1.0","type":"link"}