Amazon.com: 3.7V Battery Replacement for Texas Instruments TI-Nspire CX TI-Nspire CX CAS N2/AC/2L1/A TI-84 Plus C Silver Edition TI-Nspire CAS Touchpad TI-84 C Silver 3.7L1060SP 3.7L1230SP 3.7L1200SP Battery : Electronics
How to Change the Batteries on Your TI-83 Plus, TI-84 Plus or TI-89 | Calcblog