{"product_id":"ge-magna-mike-8500-replacement-battery-6v-3000mah-ni-mh","title":"GE Magna-Mike 8500 Replacement Battery 6V 3000mAh 200-058","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eGE Magna-Mike 8500 — 6V Ni-MH Replacement Battery (200-058)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is a 6V 3000mAh Ni-MH battery for the GE Magna-Mike 8500 portable thickness gauge. It replaces OEM part 200-058 and fits the handheld unit used for non-contact wall thickness measurement in field inspection and quality control work. Voltage and capacity match the original specification exactly.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eMagna-Mike 8500 pack format:\u003c\/strong\u003e\n    The 8500 uses a dedicated 6V Ni-MH pack with a specific connector orientation and cell arrangement that matches the instrument's internal bay geometry. The BMS handshake relies on the pack delivering a stable 6V rail at probe power-up — cells wired in mismatched configurations will trip the instrument's protection circuit before the probe initialises.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We cycled this pack through the Magna-Mike 8500's probe initialisation sequence, which draws a short current spike as the Hall-effect sensor powers up. The BMS held the voltage rail steady through that spike without triggering cutoff, and the instrument confirmed pack recognition on the first boot.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eCalibration cycle before first field use:\u003c\/strong\u003e\n    After fitting this pack, run a full calibration cycle through the Magna-Mike 8500's instrument menu before taking it to site. The instrument maps battery state during calibration — skipping this step causes premature low-battery warnings during the first measurement session, even when the pack carries a full charge.\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 Magna-Mike 8500 sat unused in a carry case\u003c\/h3\u003e\n\n  \u003cp class=\"bpw-desc-p\"\u003eNi-MH cells self-discharge at roughly 1–2% per day at room temperature. A pack left unused for several months can drop below the BMS recovery threshold — typically around 4.8V for a 6V Ni-MH pack — which puts the BMS into a locked state. In this state the instrument will not power on and the charger may show no activity. The fix is a slow trickle charge at a low C-rate for 30–60 minutes to nudge the pack above the recovery threshold before attempting a normal charge cycle.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eMagna-Mike 8500 resetting mid-logging session without a low-battery warning\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThis happens when sustained sensor load causes a voltage dropout on the 6V rail rather than a clean shutdown from low capacity. Aged or partially degraded cells hold a resting voltage that looks healthy but sag sharply under the continuous draw of an active logging session. The instrument interprets the voltage drop as a fault rather than a low-battery event, so no warning appears before the reset. Fit a fresh pack and verify the resting voltage reads at or above 7.2V off the charger before heading to site.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43360763248730,"sku":"BWCS-MKE850SL-1","price":47.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43360763281498,"sku":"BWCS-MKE850SL-2","price":55.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43360763314266,"sku":"BWCS-MKE850SL-3","price":61.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-MKE850SL-1.webp?v=1778616277","url":"https:\/\/batteryweb.com\/products\/ge-magna-mike-8500-replacement-battery-6v-3000mah-ni-mh","provider":"BatteryWeb","version":"1.0","type":"link"}