The most indispensable accessory for your Samsung SPH-z400 cellular device is the battery. Unless you are need of a paper weight even the most advanced phone is useless without power. Use this original Samsung AB803443BA Extended Battery as a replacement or spare to extend the talk time of your Samsung SPH-z400. Keep your Samsung cellular device working at optimum performance levels at all times. Just pop the Samsung AB803443BA Extended Battery in your pocket or bag and you’re good to go that extra mile, chatting with your friends, at work, or on the road.