What are the battery safety precautions I should follow with the TI-36X Pro?

Do not leave batteries within the reach of children, do not mix new and used batteries or different brands, and do not mix rechargeable and non-rechargeable batteries. Do not incinerate or dismantle batteries, and if a battery is swallowed, seek medical advice immediately — in the USA, contact the National Capital Poison Center at 1-800-222-1222.