1. Although you may carry some devices and installed batteries in checked baggage, carrying them in carry-on baggage, when practicable, is preferred. Whether in checked or carry-on baggage, ensure that devices remain switched off, either by built-in switch/trigger locks, by taping the activation switch in the “off” postion, or by other appropriate measures.
2. Be sure to take protective measures to prevent against short-circuits. See the spare battery tips and how-to pages.