TI-84 Battery Guide: Types, Life & Replacement
Everything you need to know about TI-84 calculator batteries — from what type to buy to how long they last and step-by-step replacement instructions for every TI-84 model.
Battery Types by Model
| Model | Main Battery | Backup Battery | Battery Life |
|---|---|---|---|
| TI-84 Plus | 4× AAA Alkaline | CR1616 coin cell | ~6 months |
| TI-84 Plus Silver Edition | 4× AAA Alkaline | CR1616 coin cell | ~5 months |
| TI-84 Plus CE | Built-in Li-Ion (rechargeable) | None | ~1 month per charge |
| TI-84 Plus CE Python | Built-in Li-Ion (rechargeable) | None | ~1 month per charge |
TI-84 Plus: AAA Battery Replacement
The TI-84 Plus and Silver Edition use 4 AAA batteries as the primary power source, plus a small CR1616 3V lithium coin cell as a backup to preserve memory when changing main batteries.
Turn Off Calculator
Press 2ND → ON to power off the calculator.
Open Battery Cover
Flip the calculator over. Slide the battery cover off (it's on the back, near the bottom).
Replace AAA Batteries
Remove old batteries and insert 4 new AAA alkaline batteries. Follow the polarity markings (+/−) inside the compartment.
Replace Backup Battery (Optional)
The CR1616 backup is behind a small screw-on cover. Only replace if your calculator loses memory when changing main batteries. Use a small Phillips screwdriver.
Close & Test
Slide the battery cover back on. Press ON to verify the calculator powers up. Adjust contrast if the screen appears too light or dark (2ND + ▲/▼).
💡 Tip: Use name-brand alkaline batteries (Duracell, Energizer) for best life. Avoid rechargeable NiMH AAA batteries — they output 1.2V instead of 1.5V and may cause issues.
TI-84 Plus CE: Charging Guide
The TI-84 Plus CE uses a built-in rechargeable lithium-ion battery that charges via the Micro-USB port on top of the calculator.
- Charging cable: Standard Micro-USB (included with calculator)
- Charge time: Approximately 4-6 hours for a full charge
- Battery life: About 1 month of regular classroom use per charge
- Charging indicator: A small LED on the calculator glows orange while charging and turns green when fully charged
- Can you use it while charging? Yes, the calculator works normally while plugged in
⚠️ Warning: The TI-84 Plus CE battery is NOT user-replaceable. If your battery no longer holds a charge, contact Texas Instruments support. Do NOT attempt to open the calculator — this voids the warranty and risks battery damage.
How to Extend Battery Life
- Lower screen brightness: Press 2ND + ▼ to reduce brightness
- Use auto power-off: The calculator automatically turns off after ~5 minutes of inactivity
- Turn off when not in use: Don't leave the calculator on during breaks
- Remove batteries for long storage: If not using for months, remove AAA batteries to prevent leakage (TI-84 Plus only)
- Avoid extreme temperatures: Don't leave in hot cars or freezing environments
Battery Troubleshooting
Ensure batteries are inserted correctly (check +/− polarity). Try pressing ON for 5 seconds. If still dead, try a hard reset. On TI-84 Plus CE, ensure the USB cable is plugged in and charging.
Adjust screen contrast: press 2ND and then the ▲ key (to darken) or ▼ key (to lighten). Hold for a few seconds.
Try a different USB cable and charger. Clean the Micro-USB port gently with compressed air. If the LED doesn't light up at all, the battery may need professional replacement.
CR1616 batteries are available at most electronics stores, pharmacies, and online retailers (Amazon, Walmart). They typically cost $3-5 for a pack of 2.