Olympia Viva 1 Replacement Battery 3.7V 1000mAh Li-ion

Olympia Viva 1 / Viva 2 — 3.7V Li-ion Replacement Battery

This is a 3.7V, 1000mAh (3.7Wh) Li-ion cell for the Olympia Viva 1 and Viva 2 mobile phones. It replaces the original battery when the existing cell no longer holds enough charge to keep the phone running through normal daily use. Dimensions are 53.00 × 33.90 × 5.70mm — confirm these against your existing cell before installing.

• Viva 1 and Viva 2 compatibility: Both models run the same 3.7V single-cell architecture with the same connector layout and BMS handshake requirements. One cell fits both.
• Bench tested on actual hardware: We cycled this cell through charge and discharge under load typical of a 3.7V GSM-class phone. The BMS held cutoff correctly at both ends of the voltage window without tripping prematurely.
• Fuel gauge recalibration on first use: On the first cycle after installation, run the battery from 100% down to automatic shutdown without interruption, then charge fully in one go. This gives the fuel gauge IC a complete discharge curve for the new cell and prevents percentage drift from day one.

Sudden shutdown at 20–30% on a replacement cell

This is a voltage cliff issue, not a capacity problem. Under peak load — modem transmit bursts or screen at full brightness — the new cell's internal resistance causes a voltage dip that the phone interprets as a dead battery. The BMS trips the cutoff even though the fuel gauge still shows charge remaining. The fix is completing one full uninterrupted discharge-charge cycle so the fuel gauge IC maps the actual voltage curve of the new cell. After that cycle, the reported percentage and the real cutoff threshold will align.

Phone won't power on after the replacement battery sat in storage

If the cell discharged below approximately 2.5V during storage, the BMS enters lockout mode to prevent damage to the cell. The phone will show no response — no charging indicator, no boot screen. Connect the phone to a charger and leave it untouched for 15–30 minutes without attempting to power it on. The charge IC will trickle current into the cell until it clears the BMS lockout threshold, after which normal charging resumes. If the phone still shows no sign of life after 30 minutes, check the charger output first — it must deliver at least 5V at a stable current.