Colibri pocket watches are mechanical watches, powered by a wound spring. They don't use batteries like quartz watches do.

If you have a Colibri pocket watch that you think needs a battery, it's likely that it's a different type of watch altogether, or that the watch needs servicing.

Here are some steps you can take:

1. Check the watch closely: Look for any markings or labels that might indicate the type of watch (mechanical or quartz).

2. Contact Colibri: If you're not sure, the best course of action is to contact Colibri directly. They'll be able to help you identify your watch and advise you on the appropriate steps.

3. Find a reputable watchmaker: If you have a mechanical watch, it will need to be wound regularly. You can take it to a reputable watchmaker for servicing and battery replacement if needed.

Remember, taking care of your watch is important. Regular cleaning and servicing will help to ensure that it runs smoothly for years to come.