About this replacement
HP iPAQ Glisten — 3.7V Li-ion Replacement Battery (538719-001)
This 3.7V, 1100mAh Li-ion battery replaces the original cell in the HP iPAQ Glisten (K3). It fits a Windows Mobile smartphone released in 2009 that combined phone, email, and PIM functions in a compact form factor. Dimensions are 66.13 × 43.21 × 4.57mm — confirm physical fit before installation.
- iPAQ Glisten K3 compatibility: The Glisten K3 uses a single-cell Li-ion pack at 3.7V nominal. All three OEM part numbers — 538719-001, 538722-001, and HSTNH-T21C-S — cross-reference to the same cell format, connector pinout, and BMS communication protocol used by this model.
- Bench tested on actual hardware: We cycled this cell through charge and discharge on the Glisten platform. The BMS handshake cleared on first connection, charge IC accepted the cell without flagging an error, and the protection circuit tripped correctly at the low-voltage cutoff threshold.
- Fuel gauge recalibration on first use: After fitting this cell, disable any fast-charge accessories and run one full discharge-to-charge cycle on the standard USB charger. The fuel gauge IC on the Glisten calibrates its coulomb counter against the new cell's discharge curve during that first cycle — skipping it causes erratic percentage readings until the IC catches up.
Sudden shutdown at 20–30% on the iPAQ Glisten after a cell swap
This is a voltage cliff issue, not a capacity fault. When the modem radio or backlit screen pulls peak current, a new cell that hasn't been calibrated yet can't hold voltage above the BMS cutoff threshold — so the phone shuts off even though the gauge still shows charge remaining. The fuel gauge IC is reading state-of-charge from a curve it built around the old, degraded cell. Run two full discharge-charge cycles on standard USB power and the IC will remap the curve to the new cell's actual voltage profile.
OS reports wrong battery percentage after installing the replacement cell
The Glisten's fuel gauge IC stores the discharge curve of the previous cell in memory. A new 1100mAh cell has a steeper mid-range voltage slope than a worn original, so the IC misreads remaining capacity — often showing 100% for an unusually long stretch, then dropping fast. This isn't a fault with the replacement cell. Fully drain the battery until the phone powers off automatically, then charge uninterrupted to 100%. After that single full cycle, the coulomb counter recalibrates and percentage reporting stabilises.