I'm a little bit uncomfortable about this, because it gives access to a coin cell battery.
People under-estimate how dangerous batteries can be.
https://www.cdc.gov/mmwr/preview/mmwrhtml/mm6134a1.htm
> From 1997 to 2010, an estimated 40,400 children aged <13 years were treated in hospital emergency departments (EDs) for battery-related injuries, including confirmed or possible battery ingestions. Nearly three quarters of the injuries involved children aged ≤4 years; 10% required hospitalization. Battery type was reported for 69% of cases, and of those, button batteries were implicated in 58%. Fourteen fatal injuries were identified in children ranging in age from 7 months to 3 years during 1995–2010. Battery type was reported in 12 of these cases; all involved button batteries.