Denver GSP-110 Replacement Battery 3.7V 1200mAh Li-ion

Denver GSP-110 / GSP-120 / GSP-131 — 3.7V Li-ion Replacement Battery

This is a 3.7V, 1200mAh Li-ion cell for the Denver GSP-110, GSP-120, and GSP-131 smartphones. It replaces the original battery when the cell degrades, swells, or can no longer hold a usable charge. Dimensions are 53.00 × 33.90 × 5.70mm — confirm against your existing cell before fitting.

• GSP-110, GSP-120, GSP-131 compatibility: These three Denver models share the same battery bay dimensions, voltage rail, and connector pinout, which is why one cell covers all three. The BMS on each model accepts the same charge termination voltage, so no hardware modification is needed.
• Bench tested on actual hardware: We cycled this cell through full charge and discharge on the GSP-110 platform. The BMS accepted charge termination at 4.2V and engaged protection cutoff correctly at the low-voltage threshold without tripping prematurely under screen-on load.
• Fuel gauge recalibration on first use: On the first cycle after fitting, disable fast charging if your charger supports it, then run one full discharge down to auto-shutdown and charge back to 100%. This lets the fuel gauge IC map the new cell's discharge curve before normal use — skipping this step is the main reason the percentage display jumps erratically in the first few days.

Sudden shutdown at 20–30% on the Denver GSP-110

This happens because the fuel gauge IC is still calibrated to the old cell's discharge curve. When the new cell hits its actual voltage cliff — typically around 3.5–3.6V under modem or screen load — the phone shuts down even though the gauge still shows charge remaining. The mismatch between the stored curve and the real cell behaviour causes the OS to report an inflated percentage right up until the voltage drops too fast to track. One full discharge-to-shutdown followed by an uninterrupted charge to 100% resets the coulomb counter and resolves the problem.

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

Li-ion cells shipped or stored for extended periods can drop below 3.0V, which triggers BMS lockout — the protection circuit opens and the phone appears completely dead. Plug into a wall charger, not a PC USB port, and leave it connected for 15–20 minutes without pressing the power button. Most BMS circuits on this voltage class begin accepting trickle current at around 2.5V per cell and will self-recover once enough charge accumulates to re-engage the main FET. If the charge LED does not activate within 30 minutes, try a second charger before concluding the cell is faulty.