{"product_id":"alpineq-eh237-replacement-battery-6v-650mah-ni-mh","title":"Alpineq EH237 Replacement Battery 6V 650mAh Ni-MH","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eAlpineq EH237 — 6V 650mAh Ni-MH Replacement Battery\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is a 6V, 650mAh Ni-MH replacement battery for the Alpineq EH237 mobile phone. It slots in when the original cell has degraded or no longer holds a charge. Capacity is 3.9Wh, matching the stock specification from the product data.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eEH237 cell compatibility:\u003c\/strong\u003e\n    The EH237 runs a 6V Ni-MH cell stack. Ni-MH chemistry on this platform tolerates the charge controller's trickle-charge termination logic, which detects the voltage plateau specific to Ni-MH cells — not the cutoff profile used by Li-ion packs.\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 the EH237 platform. The charge controller accepted the cell, reached the delta-V termination point correctly, and the BMS did not flag an error during the handshake sequence.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eFirst-cycle fuel gauge reset on the EH237:\u003c\/strong\u003e\n    On first use after installation, disable fast charging and run one complete discharge-to-charge cycle. This lets the fuel gauge IC recalibrate its discharge curve against the new cell before high-current charging pushes current into an uncalibrated state.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eWhy the EH237 reports wrong battery percentage after a cell swap\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThe EH237's fuel gauge IC stores a learned discharge curve from the original cell. When a new cell goes in, that stored curve no longer matches the actual voltage-versus-capacity relationship of the replacement. The OS reads the old curve and reports a percentage that does not reflect real charge state. One full discharge and charge cycle forces the IC to rewrite the curve against the new cell and the percentage display stabilises.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eSudden shutdown on the EH237 at 20–30% remaining\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eNi-MH cells have a steeper voltage drop at the bottom of their discharge curve than the fuel gauge expects when it has not been recalibrated. Under load — screen on, active call, or data transfer — the cell voltage collapses faster than the reported percentage suggests, and the phone shuts off to protect the circuit. This is not a faulty cell. Run one full discharge until the phone shuts down naturally, then charge uninterrupted to 100%, and the fuel gauge IC will map the correct voltage cliff for this cell.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43409474289754,"sku":"BWCS-ER388SL-1","price":25.99,"currency_code":"USD","in_stock":false},{"title":"Warranty 2 Year","offer_id":43409474322522,"sku":"BWCS-ER388SL-2","price":29.99,"currency_code":"USD","in_stock":false},{"title":"Warranty 3 Year","offer_id":43409474355290,"sku":"BWCS-ER388SL-3","price":32.99,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-ER388SL-big.webp?v=1779579784","url":"https:\/\/batteryweb.com\/products\/alpineq-eh237-replacement-battery-6v-650mah-ni-mh","provider":"BatteryWeb","version":"1.0","type":"link"}