darp9: Update battery replacement caution copy

src/models/darp9/repairs.md

@@ -209,7 +209,11 @@ The keyboard can be replaced if its switches or electronics have been damaged.
 
 The battery provides primary power whenever the system is unplugged.
 
-**CAUTION:** Do not use metal tools to remove the battery. Do not touch the battery contacts with your hands or metal objects. If the battery is damaged during repairs, do not reinsert it into the laptop. Do not continue to use the computer if it contains a damaged battery. It is a potential fire hazard to operate a computer with a damaged battery. Keep children away from, and properly dispose of, the damaged battery. Always dispose of batteries carefully, by placing a piece of tape on the contact points. Take damaged batteries to an electronics recycling center and contact System76 to purchase a replacement. Batteries may explode or leak if exposed to fire, or if improperly handled or discarded. Only use batteries designed for your specific computer. This product contains a rechargeable battery. The battery is recyclable. At the end of its useful life, under various state and local laws, it may be illegal to dispose of this battery into the municipal waste stream. Check with your local solid waste officials for details in your area for recycling options or proper disposal.
+**CAUTION:** Do not use metal tools to remove the battery. Do not touch the battery contacts with your hands or metal objects. If the battery is damaged during repairs, do not reinsert it into the laptop. Do not continue to use the computer if it contains a damaged battery; it is a potential fire hazard to operate a computer with a damaged battery. Keep children away from, and properly dispose of, the damaged battery.
+
+This product's battery is potentially recyclable. At the end of its useful life, under various state and local laws, it may be illegal to dispose of this battery into the municipal waste stream. Batteries may explode or leak if exposed to fire, or if improperly handled or discarded. Check with your local solid waste officials for details in your area for recycling options or proper disposal. Always dispose of batteries carefully, by placing a piece of tape on the contact points.
+
+Only use batteries designed for your specific computer. It's recommended to [contact System76](https://support.system76.com/) to purchase a replacement battery. Third-party batteries may present additional functional or safety risks. The model number for the Darter Pro 9's battery is `L140BAT-4`, also known as `6-87-L140S-72B02`.
 
 **Tools required:** Cross-head (Phillips) screwdriver  
 **Time estimate:** 30 minutes