Blackberry batteries are model specific. You can not use the battery from a Blackberry Pearl with a Blackberry Bold. The Blackberry Pearl and the Blackberry Bold require specific types of batteries according to the phone style and model number.
Customer reviews for the mobile device, Blackberry Pearl can be found on websites such as Amazon, eBay, and CNet. A professional review for the Blackberry Pearl can be found on the official Laptop Mag website.