{"product_id":"ecom-ex-handy-04-replacement-battery-37v-900mah-li-ion","title":"Ecom Ex-Handy 04 Replacement Battery 3.7V 900mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eEcom Ex-Handy 04 — 3.7V Li-ion Replacement Battery\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is a 3.7V, 900mAh Li-ion battery for the Ecom Ex-Handy 04 rugged smartphone. It fits the Ex-Handy 04 directly and restores power capacity when the original cell has degraded. Capacity is 3.33Wh — identical to the factory specification.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eEx-Handy 04 fit:\u003c\/strong\u003e\n    The Ex-Handy 04 uses a fixed 3.7V single-cell Li-ion configuration with a dedicated connector and BMS handshake tied to that voltage rail. This replacement matches those parameters so the charge IC and protection circuit communicate correctly with the device.\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 on bench equipment and monitored BMS communication at each stage. The protection circuit responded correctly to cutoff thresholds — no false trips, no thermal flags under normal load.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eFuel gauge recalibration on first cycle:\u003c\/strong\u003e\n    On first use after installation, disable fast charging for one complete discharge-charge cycle. This gives the fuel gauge IC time to map its coulomb counter against the new cell's actual discharge curve before high-current charging begins on an uncalibrated cell.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\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 because the fuel gauge IC is still running the discharge curve from the old, degraded cell. The new cell has a steeper voltage cliff at low charge states — the phone's modem or screen pulls enough current to drop the cell voltage below the BMS cutoff threshold before the reported percentage reaches zero. The OS sees a valid percentage but the cell voltage has already collapsed under load. One full discharge-to-shutdown followed by a full uninterrupted charge corrects this — the coulomb counter resets to the new cell's actual curve.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003ePhone won't power on after the battery sat in storage\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eLi-ion cells self-discharge during storage. If the cell drops below approximately 2.5V, the BMS enters lockout mode and blocks charge current to prevent damage to a deeply discharged cell. The phone shows nothing when connected to a charger. Connect the device to a wall adapter — not a PC USB port — and leave it for 15–20 minutes without pressing the power button. Most BMS circuits on this cell class include a trickle-recovery path that slowly raises cell voltage back above the 2.5V re-initialisation threshold before allowing normal charge current.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43409483530330,"sku":"BWCS-NK2NSL-1","price":23.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43409483563098,"sku":"BWCS-NK2NSL-2","price":26.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43409483595866,"sku":"BWCS-NK2NSL-3","price":29.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-NK2NSL-1.webp?v=1779579814","url":"https:\/\/batteryweb.com\/products\/ecom-ex-handy-04-replacement-battery-37v-900mah-li-ion","provider":"BatteryWeb","version":"1.0","type":"link"}