Seals VR7 Compatible Battery 3.7V 1750mAh VR-01

Seals VR7 / VR3 — 3.7V Li-ion Replacement Battery (VR-01)

This is a 3.7V Li-ion cell rated at 1750mAh (6.48Wh), built to the VR-01 specification. It fits the Seals VR7 and VR3 smartphones. Use it when the original cell no longer holds charge or causes unexpected shutdowns.

• VR7 and VR3 compatibility: Both handsets share the same battery bay dimensions (52.00 × 36.00 × 10.30mm), connector pinout, and BMS handshake protocol — one cell works across both models without any modification.
• Bench tested on actual hardware: We cycled this cell through charge and discharge on the VR7 platform. The BMS accepted the new cell, voltage held steady across full-screen and modem-active loads, and charge termination triggered correctly at 4.2V.
• Fuel gauge recalibration on first use: 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 any high-current charging session pushes current into an uncalibrated coulomb counter.

Sudden shutdown at 20–30% on the replacement cell

This happens because the fuel gauge IC is still reading a discharge curve calibrated to the old, degraded cell. The new cell has a steeper voltage drop under modem and display load, so the reported percentage and the actual cutoff voltage diverge. When real cell voltage hits the BMS floor — typically around 3.0V under load — the phone shuts down even though the gauge still shows charge remaining. One full discharge-charge cycle at standard rate re-anchors the coulomb counter to the new cell and eliminates the early cutoff.

Phone warm near the battery during the first few charges

A new cell has higher internal impedance than a broken-in one. The charge IC pushes current into that resistance, and the extra heat is normal for the first two to three cycles as the cell's impedance drops. If the phone stays warm past the third full charge, check that the charge IC is not stuck in fast-charge mode on the new cell — pull the battery, reseat it, and let the BMS renegotiate the charge rate from a cold start. Warmth should normalise once cell impedance settles below roughly 150mΩ.