The Elite Reader's delta batteries, three rechargeable AAA batteries, need to be replaced every two years, as well as the Elite Reader's main battery and decoder battery. Below are directions on replacing the Elite Reader's delta batteries.

1. Remove Elite Reader's lid
2. Unscrew two chassis screws on Delta Card
3. Remove Delta Card from chassis
4. Remove current rechargeable AAA batteries from Delta Card
5. Clean AAA terminals on Delta Card
Note: Use Contact Cleaner and Fine Grit Sandpaper if available. May use a small cotton swab with a bit of rubbing alcohol. Never use water/vinegar.
6. Insert new rechargeable AAA batteries into Delta Card
Note: Use NiMH rechargeable batteries only. Never use alkaline batteries as these will damage the Delta unit.
7. Insert Delta Card into chassis
Note: Delta Card won't connect if not on rails
8. Screw two chassis screws on Delta Card
Note: Test reader after battery replacement