{"product_id":"oneil-rp4-replacement-battery-74v-6800mah-li-ion","title":"ONeil RP4 Receipt Printer Replacement Battery 7.4V 6800mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eONeil RP4 — 7.4V Li-ion Replacement Battery (550053-000)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is a 7.4V Li-ion battery rated at 6800mAh (50.32Wh), built to replace part number 550053-000 in the Honeywell ONeil RP4 mobile receipt printer. The RP4 is a portable thermal printer used in retail, logistics, and hospitality for on-the-go receipt and label printing. When original cells degrade, this pack restores full operating voltage to the print head, paper feed motor, and wireless radio.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eRP4 platform fit:\u003c\/strong\u003e\n    The RP4 uses a 7.4V nominal rail to drive the thermal print head, paper feed motor, and Bluetooth radio from a single cell pack. All three subsystems share this voltage bus, so a weak cell affects print quality, paper feed torque, and wireless stability at the same time.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We ran this pack through charge and discharge cycles on the RP4 and confirmed the BMS handshake completed without fault flags. The protection circuit responded correctly to motor-start current draw from the paper feed mechanism and held voltage within the thermal head's operating range.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eFirst-use print sequence:\u003c\/strong\u003e\n    After installing and fully charging, print five test receipts before deploying in the field. The paper feed motor draws a calibration-level current pulse on each cycle, and running this sequence confirms the BMS has correctly profiled the load signature of 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\"\u003eWhy the RP4 refuses to print after sitting unused for weeks\u003c\/h3\u003e\n\n  \u003cp class=\"bpw-desc-p\"\u003eLi-ion cells self-discharge during storage. If the RP4 sits unused long enough, the pack voltage drops below the printer's minimum motor drive threshold — typically around 6.8V for the RP4's feed mechanism. At that point, the firmware blocks printing to protect the thermal head from under-voltage operation. Connecting to charge and waiting for the pack to recover past that threshold is the fix. Do not attempt to print during the recovery charge — let it reach at least 7.0V first.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eFaded or uneven print output on a freshly installed battery\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThe thermal print head on the RP4 requires a stable voltage to heat elements evenly across the print line. If voltage sags mid-print — common when a new pack hasn't completed its first full charge — some elements don't reach target temperature and leave faint or missing lines on the receipt. This is not a head fault. Charge the pack fully (to 8.4V), then run the five-receipt test sequence. Print quality normalises once the BMS has established the correct current profile for the load.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43415992795226,"sku":"BWCS-HPR400XL-1","price":77.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43415992827994,"sku":"BWCS-HPR400XL-2","price":91.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43415992860762,"sku":"BWCS-HPR400XL-3","price":101.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-HPR400XL-1.webp?v=1779758840","url":"https:\/\/batteryweb.com\/products\/oneil-rp4-replacement-battery-74v-6800mah-li-ion","provider":"BatteryWeb","version":"1.0","type":"link"}