"Show percentage" indicator option shows 0% for Dualshock4 battery
Dualshock4 connected via BT.

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Same, shows 0%. Also the battery icon on the wingpanel doesn't change accordingly to the remaining battery charge, but instead stays always at about 80%.
Same for a Logitech MX Performance mouse.
So, I have a same problem in my MacPro 2010. However, the command sudo tlp-stat shows me: Charge 95.6% - Capacity 62.3%. I think that the SO (eOS) shows in top bar just the capacity. My battery is original (2010) and does not fully charge.
To mee it seems that the issue is UI related because the top 0% is references only Main power source of the computer. because a BT connected device can never be a main power source it shows 0%. in this case we should show a differend icon and hide the presentage showing option. (a.k.a strip down the indicator UI)