Telex RadioCom BTR-500/600C - Manual (Page 22)

Battery Installation
Insure that the OFF/ON volume control knob is
turned OFF. Press down the battery release latch
and remove battery pack. Pack slides off in opposite
direction. Replace batteries as follows:
Figure 36
Battery Installation
-19-
1. Open the battery pack by inserting finger
nail and lifting as shown.
2. Pull battery strap to remove low or
dead batteries.
3. Load new batteries with negative end against the spring.
4. Start loading at hinged end of case.
5. Be sure strap goes under batteries and over the top of the ribs.
6. Tuck end of strap under door when closing.