If the recharge fails:
| • | Make sure the graphing calculator is seated properly in the slot. Batteries are not charged if the connector on the graphing calculator and the connector in the slot are not aligned. |
| • | Check the connector on the graphing calculator to ensure that it is clean. If there is build-up on the graphing calculator’s connector, you can remove it with a clean, dry cloth or a pencil eraser. Never use wet cloths or solutions of any kind. |