{"product_id":"midtronics-op-5500-replacement-battery-36v-2000mah-ni-mh","title":"Midtronics OP-5500 Compatible Battery 3.6V 2000mAh Ni-MH","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eMidtronics OP-5500 — 3.6V Ni-MH Replacement Battery (59873353)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is a 3.6V 2000mAh Ni-MH replacement battery for the Midtronics OP-5500 battery analyzer and load tester. It fits the OP-5500 directly, using OEM part references 59873353, BP-55, and HHR-15F3G1. Capacity is sourced from the product specification — 2000mAh (7.2Wh).\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eOP-5500 platform fit:\u003c\/strong\u003e\n    The OP-5500 draws from a single 3.6V NiMH cell block with a fixed connector and a BMS that handshakes on pack recognition at power-up. All three OEM part numbers — 59873353, BP-55, and HHR-15F3G1 — reference the same cell format, voltage rail, and connector footprint used across this analyzer generation.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We cycled this pack through the OP-5500's standard power-on sequence and load test routine. The BMS accepted the pack without triggering a fault code, and the cell voltage held within the expected window through a full diagnostic cycle.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eFirst-use calibration cycle:\u003c\/strong\u003e\n    After installing this pack, run a full calibration sequence through the OP-5500's instrument menu before taking it into the shop. The analyzer maps battery state during calibration — skipping this step causes premature low-battery warnings during the first live testing session, even with a fully charged pack.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eBMS lockout after the OP-5500 sat unused in a carry case for months\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eNi-MH cells self-discharge during storage, and if the pack drops below approximately 0.9V per cell, the BMS enters a protection state and refuses a standard charge cycle. The OP-5500 will either show no response or a battery fault at power-up. To recover, apply a slow trickle charge at low current — most smart chargers have a recovery or reconditioning mode that brings the cell voltage back above the 1.0V threshold before switching to normal charge. Once the pack reads above 3.2V total, a standard charge cycle completes normally.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eOP-5500 shuts down the moment a load test sequence initiates\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThe OP-5500 draws a short current spike when it energises the load test circuit at the start of a test sequence. A degraded or partially discharged pack can't sustain that spike, and the BMS trips into cutoff to protect the cells — the analyzer goes dark mid-operation. This is different from a low-battery warning during idle use. Charge the pack fully to 3.6V before running load tests, and confirm the charger completed a full cycle rather than stopping early on a timed cut-off.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43360435667034,"sku":"BWCS-MTP550SL-1","price":38.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43360435699802,"sku":"BWCS-MTP550SL-2","price":45.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43360435732570,"sku":"BWCS-MTP550SL-3","price":49.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-MTP550SL-1.webp?v=1778614760","url":"https:\/\/batteryweb.com\/products\/midtronics-op-5500-replacement-battery-36v-2000mah-ni-mh","provider":"BatteryWeb","version":"1.0","type":"link"}