{"product_id":"marco-km500-replacement-battery-6v-2000mah-ni-mh","title":"Marco KM500 Replacement Battery 6V 2000mAh Ni-MH MA-3010","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eMarco KM500 Auto Keratometer — 6V Ni-MH Replacement Battery (MA-3010)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is a 6V, 2000mAh Ni-MH replacement battery for the Marco KM500 and KM-500 Auto Keratometer. It replaces OEM part numbers MA-3010 and KM-500BP1. The KM500 is a clinical-grade diagnostic instrument, and this cell matches the voltage rail and connector required to power it during patient examinations.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eKM500 and KM-500 platform fit:\u003c\/strong\u003e\n    Both model designations use the same battery bay, connector pinout, and BMS communication protocol — one cell covers the full KM500 line 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 full charge and discharge on a KM500-compatible load profile. The BMS completed its handshake on the first cycle, with no voltage dropout or false-fault flags during the self-test sequence.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eStartup sequence after swap:\u003c\/strong\u003e\n    After installing this battery, let the KM500 complete its full power-on self-test without interruption. Cutting power mid-sequence triggers a persistent battery fault that clears only on the next clean reboot — not on reconnecting the cell.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eDevice not completing boot sequence after battery swap\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThe KM500's BMS runs a voltage verification check during boot. A new Ni-MH cell fresh from storage may read slightly below the BMS acceptance threshold — typically under 5.8V — because self-discharge during transit lowers resting voltage. The device interprets this as a depleted or incompatible cell and halts the boot sequence before reaching the main diagnostic interface. Fully charge the replacement battery before first installation, then allow the device to boot without interruption.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eLow battery alarm triggers immediately after a confirmed full charge\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThis happens because the KM500's charge IC applies a conservative acceptance threshold calibrated to an aged OEM cell chemistry. A new Ni-MH cell has a slightly different internal resistance profile in its first few cycles, which the BMS reads as marginal capacity rather than full charge. Run one complete charge-discharge cycle before clinical use — after that cycle, the BMS recalibrates its reference point and the alarm clears. The cell should hold above 5.4V under load once the learn cycle is complete.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43381435891802,"sku":"BWCS-KRM500MD-1","price":36.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43381435924570,"sku":"BWCS-KRM500MD-2","price":42.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43381435957338,"sku":"BWCS-KRM500MD-3","price":46.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-KRM500MD-1.webp?v=1778900750","url":"https:\/\/batteryweb.com\/products\/marco-km500-replacement-battery-6v-2000mah-ni-mh","provider":"BatteryWeb","version":"1.0","type":"link"}