{"product_id":"blu-dash-jr-replacement-battery-37v-900mah-li-ion","title":"C474705100T BLU Dash JR Replacement Battery 3.7V 900mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eBLU Dash JR D140 \/ D141 Series — 3.7V Li-ion Replacement Battery (C474705100T)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is a 3.7V, 900mAh Li-ion cell built to fit the BLU Dash JR and its D140, D141S, and D141W variants. It replaces part number C474705100T when the original cell degrades and can no longer hold adequate charge. Physical dimensions are 47.65 × 47.04 × 4.85mm — verify against your existing cell before installing.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eD140 \/ D141 series compatibility:\u003c\/strong\u003e\n    The D140, D141S, and D141W share the same battery bay dimensions and connector pinout, so one cell covers all three variants without modification. The BMS handshake on each model communicates over the same thermistor line, so the charge IC accepts this cell on the first connect.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We cycled this cell through the D140 charge IC and confirmed BMS communication was established cleanly at 3.7V nominal. The protection circuit tripped correctly at the low-voltage cutoff threshold with no false lockouts.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eFuel gauge recalibration on first use:\u003c\/strong\u003e\n    Disable fast charging for the first complete discharge-charge cycle after installation. This gives the fuel gauge IC time to map the new cell's discharge curve before high-current charging begins — skipping this step causes the coulomb counter to read against stale calibration data from the old cell.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eWhy the Dash JR reports wrong battery percentage after a cell swap\u003c\/h3\u003e\n\n  \u003cp class=\"bpw-desc-p\"\u003eThe fuel gauge IC on the D140 series stores a learned discharge curve from the original cell. When a new cell goes in, that stored curve no longer matches the actual voltage-to-capacity relationship of the replacement. The gauge reads voltage correctly but maps it to the wrong state-of-charge percentage. One full discharge to auto-off followed by a complete charge to 100% forces the coulomb counter to recalibrate against the new cell's actual curve.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eSudden shutdown at 20–30% on the Dash JR after replacement\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThis is a voltage cliff problem, not a capacity fault. Under the combined load of the modem radio and screen backlight, the cell voltage drops sharply — faster than the fuel gauge predicts — and crosses the protection circuit cutoff before the reported percentage reaches zero. It happens most often during calls or while streaming. Run one full calibration cycle first; if shutdowns continue, check that the battery connector is fully seated, as a partial connection increases internal resistance and accelerates the voltage drop under load.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43404148801626,"sku":"BWCS-BLD140SL-1","price":23.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43404148834394,"sku":"BWCS-BLD140SL-2","price":26.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43404148867162,"sku":"BWCS-BLD140SL-3","price":28.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-BLD140SL-1.webp?v=1779369080","url":"https:\/\/batteryweb.com\/products\/blu-dash-jr-replacement-battery-37v-900mah-li-ion","provider":"BatteryWeb","version":"1.0","type":"link"}