T-Mobile Revvl 2 Plus Compatible Battery TLP038C1 3.85V 3900mAh

T-Mobile Revvl 2 Plus / 6062Z — 3.85V Li-Polymer Replacement Battery (TLP038C1)

This is a 3.85V, 3900mAh Li-Polymer battery for the T-Mobile Revvl 2 Plus (model 6062Z). It replaces OEM part TLP038C1 when the original cell degrades or fails to hold a usable charge. The battery matches the physical dimensions and connector spec of the factory unit at 87.80 x 60.40 x 4.12mm.

• Revvl 2 Plus / 6062Z fit: The Revvl 2 Plus and its 6062Z model code share the same chassis and battery bay. Both use the TLP038C1 footprint with the same flex connector orientation, so one cell covers both designations without modification.
• Bench tested on actual hardware: We ran full charge and load cycles on this cell and confirmed the BMS communicates correctly with the Revvl 2 Plus charge IC. Voltage held stable across screen-on and modem-active loads without premature cutoff.
• Fuel gauge recalibration on first use: After installation, disable fast charging and run one complete discharge down to auto-shutoff, then charge to 100% on standard current. This gives the fuel gauge IC a clean reference curve against the new cell before high-current charging begins.

Why the Revvl 2 Plus reports wrong battery percentage after a cell swap

The Revvl 2 Plus uses a coulomb counter-based fuel gauge that builds its state-of-charge model from the original cell's discharge curve. When you install a new cell, that stored curve no longer matches the actual voltage-versus-capacity relationship of the replacement. The gauge reads voltage but maps it against stale calibration data, which produces percentage readings that are off by 10–20%. One full discharge-charge cycle resets the reference and brings the displayed percentage back in line with actual capacity.

Sudden shutdown at 20–30% remaining on the new cell

This happens when the modem or display pulls a high instantaneous current and the cell voltage dips below the BMS cutoff threshold — even though the gauge still shows charge remaining. It is a voltage cliff event, not a capacity failure. A new cell going through its first few cycles can show steeper voltage sag under load until the electrodes stabilise. If shutdowns continue past the third full cycle, check that the battery connector is fully seated; a partial connection raises contact resistance and worsens sag under load, dropping cell voltage to the 3.0V cutoff faster than expected.