{"product_id":"lark-bjorn-lark-sp-220-replacement-battery-37v-1200mah-li-ion","title":"BL-6SP Lark Bjorn SP-220 Replacement Battery 3.7V 1200mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eLark Bjorn SP-220 \/ SP-230 Dual — 3.7V Li-ion Replacement Battery (BL-6SP)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThe BL-6SP is a 3.7V 1200mAh Li-ion cell that fits the Lark Bjorn SP-220, SP-220 Dual, SP-230 Dual, and SP-230 Dual SIM smartphones. It replaces an original cell that has degraded, lost hold time, or stopped charging. Rated at 4.44Wh and measuring 53.00 × 33.90 × 5.70mm — confirm these dimensions against your existing battery before fitting.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eSP-220 and SP-230 Dual compatibility:\u003c\/strong\u003e\n    Both series share the same battery bay dimensions and the BL-6SP connector pinout. The voltage rail at 3.7V nominal is consistent across single and dual-SIM variants, so one cell covers all four fit models listed.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We cycled the BL-6SP through charge and discharge on the SP-220 platform. The BMS accepted the cell without protection trips, and the charge IC reached cutoff at the expected 4.2V ceiling.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eFuel gauge recalibration after installation:\u003c\/strong\u003e\n    On first use, disable fast charging if your handset supports it, then run one complete discharge-to-charge cycle. This lets the fuel gauge IC map its coulomb counter to the new cell's 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 Lark Bjorn SP-220\u003c\/h3\u003e\n\n  \u003cp class=\"bpw-desc-p\"\u003eThis is a voltage cliff failure, not a capacity failure. When the modem fires for a call or the display backlights at full brightness, the cell must deliver a short current spike. An aged or deeply cycled cell cannot hold voltage above the BMS cutoff threshold during that spike, so the BMS trips and the phone shuts off even though the OS reported charge remaining. A fresh BL-6SP cell has lower internal impedance, so voltage sag under load stays within the operating window. After fitting, run one full discharge cycle so the fuel gauge IC recalibrates to the new cell before trusting the percentage reading.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003ePhone will not 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 BL-6SP dropped below approximately 2.5V, the BMS enters lockout to prevent cell damage and the phone shows no sign of life. Connect the original charger and leave it undisturbed for 15–20 minutes — the charge IC applies a low-current pre-charge trickle to bring the cell back above the BMS re-enable threshold. Once voltage climbs past roughly 3.0V, the BMS releases lockout and the phone will power on normally. Do not attempt a hard reset before completing this trickle phase.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43405032030298,"sku":"BWCS-NK5CHL-1","price":40.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43405032063066,"sku":"BWCS-NK5CHL-2","price":47.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43405032095834,"sku":"BWCS-NK5CHL-3","price":52.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-NK5CHL-1.webp?v=1779369842","url":"https:\/\/batteryweb.com\/products\/lark-bjorn-lark-sp-220-replacement-battery-37v-1200mah-li-ion","provider":"BatteryWeb","version":"1.0","type":"link"}