GLiDERS™ have two contacts that keep constant pressure on the button cell. A third party testing service has confirmed this to be a reliable and intermittent free connection even under high shock and vibration conditions as found in hand held products. The two lobes shown in the bottom of each photo are finger grips designed to aid in removing the battery. Simply pulling straight back while rocking or twisting side to side releases the plastic tray from the retainer housing.