AB463651GZ Verizon DoubleTake Replacement Battery 3.7V 850mAh

Verizon Intensity SCH-U450 / DoubleTake — 3.7V Li-ion Replacement Battery (AB463651GZ)

This is a 3.7V, 850mAh Li-ion cell built to fit the Verizon DoubleTake, Intensity SCH-U450, Glyde 2, and eight additional handsets sharing the same battery bay and connector. It replaces OEM part AB463651GZ and its variants (AB463651GZBSTD, SAMINTBATS2). Capacity is 850mAh — 3.15Wh — matching the original cell specification.

• Multi-model fit — Intensity, DoubleTake, Glyde 2: These handsets share an identical battery cavity, contact plate spacing, and BMS handshake protocol. One cell covers the full platform without modification.
• Bench tested on actual hardware: We cycled this cell through full discharge and charge on an Intensity SCH-U450 body. The BMS accepted charge on the first cycle, thermal cutoff did not trip, and voltage held stable through screen and radio load.
• Fuel gauge recalibration on first install: On first use after installation, disable fast charging and run one complete discharge-charge cycle before resuming normal use. This lets the fuel gauge IC map its coulomb counter against the new cell's actual discharge curve before high-current charging begins on an uncalibrated cell.

Sudden shutdown at 20–30% on the Intensity SCH-U450 after a cell swap

The SCH-U450's fuel gauge IC holds a discharge curve calibrated to the original cell. A new cell with a different internal impedance profile hits a voltage cliff at a point the gauge hasn't mapped yet. Under modem or backlight load, the cell voltage drops below 3.4V faster than the gauge expects. The phone interprets this as a fault and shuts down even though the gauge still reads 20–30%. One full discharge-charge cycle recalibrates the coulomb counter and eliminates these early cutoffs.

Phone warm near the battery during the first few charges after replacement

A fresh Li-ion cell starts with slightly higher internal impedance than a broken-in cell. The charge IC pushes current into higher resistance, and that converts more energy to heat than usual. This is normal for the first two to three cycles and reduces as the cell's impedance settles. If the phone stays warm past the fourth charge cycle, check that the back cover is fully seated — a gap traps heat against the cell. Measure surface temperature at the battery cover; above 45°C warrants stopping the charge.