{"product_id":"cpa-halo-x-replacement-battery-37v-1700mah-li-ion","title":"CPA HALO X Smartphone Replacement Battery 3.7V 1700mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eCPA HALO X — 3.7V Li-ion Replacement Battery\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis 3.7V, 1700mAh Li-ion battery replaces the original cell in the CPA HALO X smartphone. It restores full power to the handset when the factory cell has degraded past usable capacity. Dimensions are 66.20 × 44.00 × 5.10mm — measure your existing cell before fitting.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eCPA HALO X fit:\u003c\/strong\u003e\n    The HALO X uses a compact removable cell with a low-current BMS tied to the phone's fuel gauge IC. This replacement matches the voltage rail and connector pinout that the HALO X power management circuit expects.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We cycled this cell through charge and discharge under a controlled load matching the HALO X draw profile. The BMS held cutoff correctly at both ends of the voltage window and did not trip under simulated screen and modem load.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eFuel gauge recalibration on first use:\u003c\/strong\u003e\n    On first installation, run one full discharge to auto-off, then charge uninterrupted to 100% before use. The HALO X fuel gauge IC calibrates its coulomb counter against the new cell's discharge curve during this first full cycle — skipping it causes erratic percentage readings.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eWhy the HALO X reports wrong battery percentage after a cell swap\u003c\/h3\u003e\n\n  \u003cp class=\"bpw-desc-p\"\u003eThe HALO X stores its battery model — discharge curve, internal resistance baseline, and full-charge capacity — in the fuel gauge IC's non-volatile memory. That data was built around the original cell. When a new cell goes in, the stored curve no longer matches actual cell behaviour, so the reported percentage drifts. One complete discharge-to-auto-off followed by an uninterrupted full charge forces the IC to rebuild its model against the new cell. After that cycle, percentage reporting stabilises.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eSudden shutdown at 20–30% on the replacement cell\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThis happens when the cell voltage drops sharply under load — modem transmit or screen brightness spikes — faster than the fuel gauge predicts. The phone's protection circuit sees voltage fall below the cutoff threshold and shuts down before the reported percentage reaches zero. The root cause is an uncalibrated discharge curve: the IC expects gradual voltage drop but the new cell has different internal resistance. Run the full recalibration cycle first. If shutdowns continue after two full cycles, check that cell voltage reads above 3.5V under no-load conditions before charging.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43404135759962,"sku":"BWCS-ARS850SL-1","price":22.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43404135792730,"sku":"BWCS-ARS850SL-2","price":25.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43404135825498,"sku":"BWCS-ARS850SL-3","price":27.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-ARS850SL-1.webp?v=1779369036","url":"https:\/\/batteryweb.com\/products\/cpa-halo-x-replacement-battery-37v-1700mah-li-ion","provider":"BatteryWeb","version":"1.0","type":"link"}