What precautions should be taken when designing and using lithium button batteries?

When designing applications that use lithium button cells, it's important to understand the strengths and weaknesses of the batteries and design accordingly.

Button cells can provide high peak currents, but their usable capacity decreases as the supply voltage drops during use.

When designing button cell operation:

1. It's important to know that the battery capacity will vary depending on the actual load pattern;

2. Measures to extend battery life include:

a. Maximizing effective capacity: Choose active devices (ICs) with the lowest possible minimum operating voltage;

b. Selecting devices with the lowest peak current;

c. Designing power management to avoid multiple high-power-consuming devices (such as RF chips, LEDs, LCDs, etc.) putting a load on the battery at the same time;

3. A fixed battery compartment is used to prevent children from accessing the batteries.