About this replacement
HP Tablet 7 1800 / Slate 7 Series — 3.7V Li-Polymer Replacement Battery (HSTNH-B14C-S)
This is a 3.7V, 4100mAh Li-Polymer battery for the HP Tablet 7 1800 and Slate 7 series, including the Slate 7 1800, Slate 7 Voice Tab, and Slate 7 Voice Tab Dual SIM. It replaces OEM part numbers HSTNH-B14C-S, HSTNH-B20C-S, 739691-001, and 10979176-00. Swap this in when the original cell no longer holds a charge or the tablet shuts down unexpectedly under load.
- Slate 7 series compatibility: These models share the same 3.7V single-cell architecture, connector pinout, and BMS handshake protocol — which is why one cell covers the full lineup. The fuel gauge IC communicates over a dedicated line; a cell mismatch here causes instant rejection at boot.
- Bench tested on actual hardware: We ran this cell through charge and discharge cycles on Slate 7 hardware. The BMS accepted the new cell without fault codes, and the charge IC stepped through CC/CV phases cleanly with no thermal events or negotiation failures.
- Fuel gauge recalibration after swap: After installing this battery, run the tablet down to automatic shutoff under normal screen-on use — do not force-power-off. Then charge uninterrupted to 100% without unplugging. This single full cycle lets the fuel gauge IC re-anchor its calibration to the new cell's actual capacity curve.
Tablet shutting down at 15–25% remaining after battery replacement
This happens when the fuel gauge IC is still calibrated to the old cell's voltage-capacity curve. The new cell's voltage drops more steeply near the bottom of the curve than the degraded original did — so the IC interprets a normal mid-discharge voltage as critically low and triggers a protective shutdown. It is not a fault with the replacement cell. Run one complete discharge to automatic cutoff, then charge uninterrupted to 100% — after that cycle the IC recalibrates and shutdowns at low percentage stop.
Fast charge not available after battery swap on Slate 7
Some Slate 7 units show only standard charge rates after a battery replacement, even when using the original charger. The charge controller stores negotiation state from the previous cell and needs one accepted full charge cycle to re-establish the handshake with the new cell's BMS. Plug in using the original HP adapter and allow a full uninterrupted charge to 100%. If fast charge still does not activate after that cycle, confirm the adapter output — the HP Slate 7 charger should supply 5V at a minimum of 1.0A to trigger the higher charge rate.