Based on the type of beacons you have you will have to follow different steps to open them up and then replace their specific batteries.

Indoor / Outdoor beacons  

Remove the back cover using something sharp (e.g. a guitar pick) to find 4 AA batteries.

Battery type - AA

Keychain beacons 

Open up the beacon from the bottom hinge near the keychain hanger using a pick or something sharp.

Battery type - CR2032

Pocket beacons

Open up the beacon by pulling it up from near the power button.

Battery type - CR2477

Long range beacons

Remove the grey rubber lining present on the back-side of the beacon using a pair of forceps. Remove the screw on the four corners and then lift the cover to find 4 AA batteries.

Battery type - AA

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