1. Online retailers: This is often the most convenient option, as you can browse and compare prices from multiple sellers without leaving your home. Some popular online retailers that sell batteries for Challenge cordless drills include Amazon, eBay, and Home Depot.
2. Hardware stores: You may also be able to find a battery for your Challenge cordless drill at your local hardware store. Prices and selection may vary from store to store, so it's a good idea to call ahead to see if they have the battery you need in stock.
3. Authorized service centers: If you're looking for a genuine Challenge battery, you can find one at an authorized service center. Service centers can perform diagnostics on your drill and ensure that the battery you purchase is compatible with your model.
