TI Nspire CX CAS (Black) & CX CAS II (Blue) Battery Size Comparison. 1060mAh, larger, and heavier vs. 1,200mAh, smaller, and lighter. Battery tech has advanced. : r/calculators
Texas Instruments Nspire CX II CAS Graphing Calculator Rechargeable Computer Algebra System CAS Battery Powered 2 x 7.3 x 11.8 Gray 1 Each - Office Depot