{"product_id":"olympia-viva-1-replacement-battery-37v-1200mah-li-ion","title":"LN-4C Olympia Viva 1 Replacement Battery 3.7V 1200mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eOlympia Viva 1 \/ Viva 2 — 3.7V Li-ion Replacement Battery (LN-4C)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThe LN-4C is a 3.7V, 1200mAh Li-ion cell for the Olympia Viva 1 and Viva 2 mobile phones. Both handsets share the same battery bay geometry and connector, so one cell covers both models. Dimensions are 53.00 × 33.90 × 5.70mm — verify against your existing cell before installing.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eViva 1 and Viva 2 compatibility:\u003c\/strong\u003e\n    Both models run the same 3.7V battery rail with an identical connector and bay footprint. The BMS handshake requirements are the same across both, so one SKU fits either handset without modification.\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 the Viva platform and confirmed the BMS accepted the cell without triggering protection cutoff. Charge acceptance was consistent from the first cycle.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eFuel gauge recalibration after swap:\u003c\/strong\u003e\n    On first use after installation, disable fast charging and run one complete discharge-charge cycle at standard rate. This lets the fuel gauge IC map the new cell's discharge curve before the charge IC applies higher current — skipping this step can leave the percentage counter miscalibrated by up to 15%.\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 Viva after a cell swap\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThe Olympia Viva's fuel gauge IC stores a discharge curve from the original cell. A new cell has a different internal resistance profile, so the IC underestimates how fast voltage drops under load from the modem or screen backlight. When actual cell voltage falls below the BMS cutoff threshold — typically around 3.0V per cell — the phone shuts down even though the OS still shows charge remaining. One full discharge-charge cycle at standard rate forces the coulomb counter to relearn the new curve. After that cycle, reported percentage and actual voltage align.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003ePhone won't power on after the LN-4C sat in storage discharged\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eLi-ion cells shipped or stored at very low state of charge can fall below 2.5V per cell, which triggers BMS lockout — the protection circuit opens and blocks current flow entirely. Plugging straight into the phone does nothing because the phone's charge IC won't fire until it sees a minimum voltage from the battery. Connect the phone to a wall charger and leave it for 15–20 minutes without pressing any button; most charge ICs apply a low trickle to recover cells from lockout before resuming normal charge. If the phone still shows no response after 30 minutes on the charger, check that cell voltage has recovered to at least 3.0V using a multimeter at the battery terminals.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43405032980570,"sku":"BWCS-NK5CHL-1","price":40.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43405033013338,"sku":"BWCS-NK5CHL-2","price":47.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43405033046106,"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\/olympia-viva-1-replacement-battery-37v-1200mah-li-ion","provider":"BatteryWeb","version":"1.0","type":"link"}