About this replacement
Texas Instruments TI-Nspire CX / CX CAS — 3.7V Li-ion Replacement Battery (3.7L1060SP)
This 3.7V, 1300mAh Li-ion cell replaces the internal rechargeable battery in the Texas Instruments TI-Nspire CX and TI-Nspire CX CAS graphing calculators. It also fits the TI-84 Plus C Silver Edition and related N2/AC/2L1/A variants. Matches OEM part numbers 3.7L1060SP, 3.7L1230SP, 3.7L1200SP, and 541383800002 series cells.
- TI-Nspire CX and CX CAS compatibility: Both the standard CX and the CAS variant share the same battery bay dimensions, connector pinout, and BMS communication protocol — this cell works in either without modification.
- Bench tested on actual hardware: We cycled this cell in a TI-Nspire CX and confirmed the BMS accepted the charge curve without triggering a fault state. Voltage held steady across charge and discharge without dropout.
- RAM data protection before swap: Export or photograph all stored programs, lists, and variables before removing the battery. The TI-Nspire CX stores user data in RAM powered directly by the main cell — pulling the battery clears everything in that memory instantly.
Calculator clock resetting after battery replacement
The TI-Nspire CX uses the main Li-ion cell to maintain its real-time clock — there is no dedicated backup coin cell on this board. When the main battery is removed, the RTC loses power and resets to a default timestamp. After fitting the new cell, go to Settings → General → Date and Time and set the correct values manually. This does not affect math or CAS functions, but OS-level file timestamps will be wrong until corrected.
New battery shows low charge indicator immediately after installation
Replacement cells ship at storage voltage — typically around 3.6V — not at a full 4.2V charge. The CX battery indicator reads this as a low or partially depleted state, which is normal. Connect the calculator to the TI wall adapter or USB port and allow a full charge cycle to complete before drawing conclusions about cell capacity. Once the cell reaches 4.2V and the indicator shows full, the reading stabilises.