Safety Standard 16 CFR 1263
5.5 Battery compartments Construction - Secure the battery compartment using
Option 1:it requires a tool, such as a screwdriver or coin
• Opening must require a minimum torque of 0.5 Nm (4.4 in-lb) and a minimum angle of 90 degrees of rotation, or the fastener(s) must engage a minimum of two full threads.
Option 2: it requires a minimum of two independent and simultaneous hand movements to open.

5.6 Screws or fasteners must be captive to the door, cover, or device

PERFORMANCE requirements
6.1 Button/coin cell batteries shall not be accessible or liberated from the product as a result of mechanical abuse tests

Products with button cell or coin batteries that are removable or replaceable.
5.2/5.3/5.4 A removable or replaceable button cell or coin battery must not be accessible
Accessibility Test:
① Determine whether Test Probe 11 from IEC 61032 can touch the battery.
② If part of the compartment may be opened or removed either without using a tool or with less effort than two
independent and simultaneous movements by hand, open or remove such part.
③ If the battery compartment enclosure is protected by pliable material such as fabric, paper etc., apply 70.0 N (15.7 lbf) tension Test for Seams Per ASTM F963
④ Repeat test to determine whether Test Probe 11 from IEC 61032 can touch the battery.

6.2 Pre-conditioning: a) Stress relief test - at least 7 hours at 70°C (158 °F) or 10°C (18 °F) higher than the maximum operation temperature - cool to room temperature after removal from the oven.

b) Battery replacement test - Open the battery compartment enclosure, remove and replace the button cell or coin battery, and close the battery compartment enclosure for a total of 10 cycles. If secure with screw, screw must be loosened and then tightened each time with the Torque in UL60065 Table 20.
Safety Standard 16 CFR 1263

6.3.5 Compliance.
• 6.3.5.1 After the tests of 6.3.2 – 6.3.4B, a force of 50 +10/-0 N (11.2 +2.2/-0 lbf) is applied for 10 s to the battery compartment door/cover or enclosure by a rigid test finger according to Test Probe 11 of the Standard for Protection of Persons and Equipment by Enclosures – Probes for Verification, IEC 61032. The probe is applied at the most unfavorable place and in the most unfavorable direction. The force shall be applied in only one direction. A battery compartment door/cover shall not open and shall remain functional. The battery shall not be accessible.
Safety Standard 16 CFR 1263

Products with button/coin cells that are not intended to allow user removal/replacement
CONSTRUCTION requirements
5.7 The button/coin cell shall meet one of following:

a) Made inaccessible by an enclosure or similar means that passes the applicable tests of 6.2 and6.3( Meets the same requirements as battery compartment for replaceable batteries); or

b) Held fully captive by the use of soldering, fasteners such as rivets, or equivalent means. The securement method shall pass the Secureness Test of 6.4.
Safety Standard 16 CFR 1263