About this replacement
Motorola RAZR V3 — 3.7V Li-ion Replacement Battery (SNN5696)
This is a 3.7V, 1400mAh Li-ion replacement battery for the Motorola RAZR V3 flip phone. It fits the original V3 battery slot directly, using OEM part references SNN5696, SNN5696A/B/C, BA700, and 22320. If your V3 no longer holds a charge or shuts down unexpectedly, this cell restores the phone to working condition.
- V3 platform fit: The RAZR V3 uses a single-cell Li-ion pack at 3.7V nominal. All SNN5696 variants share the same connector pinout and BMS handshake, so this replacement communicates correctly with the V3's charge IC without triggering a fault state.
- Bench tested on actual hardware: We cycled this cell through the V3's charge IC and confirmed the BMS accepted the charge handshake on the first connection. Cutoff voltages at both ends — 4.2V full and 3.0V low — matched expected thresholds with no premature cutoff events.
- Fuel gauge recalibration on first use: After installing this cell, run one full discharge down to automatic shutoff, then charge to 100% uninterrupted. The V3's fuel gauge IC was calibrated to the original cell's discharge curve — this single cycle resets the reference so percentage readings stay accurate.
Why the RAZR V3 reports wrong battery percentage after a cell swap
The V3 uses a simple coulomb-counting fuel gauge with no automatic recalibration on power cycle. When a new cell goes in, the IC still references the discharge curve of the degraded original battery. This mismatch causes the percentage to read high early and then drop fast near the bottom. One full discharge-to-shutoff followed by an uninterrupted charge to 4.2V resets the count and brings readings back into line.
Sudden shutdown at 20–30% on the replacement cell
This happens when the cell voltage drops below the modem's minimum rail voltage under load — even though the fuel gauge still shows charge remaining. On the RAZR V3, GSM transmit bursts pull current spikes that cause a momentary voltage sag. A new cell with an uncalibrated fuel gauge hits this sag earlier than expected. After completing the first full discharge-charge cycle, the gauge recalibrates and the shutoff point shifts back toward 3.2V under load rather than triggering prematurely at 3.5V.