Male DC Plug To 9V Battery Clip

This adapter cord enables you to quickly power your electronic projects, which come with a DC jack. The tip positive 2.1 x 5.5 mm DC plug will replace your power adapter for true portable use.
In other words, many amp boards, and other small project boards, have a tip positive 2.1 x 5.5 mm DC power receptacle. If you don't have an AC/DC power adapter you could solder together a 9 volt battery clip to a DC plug for battery power.
Highlights:

• Plugs into common tip positive 2.1 x 5.5 mm jacks
• 9 volt clip can plug into a 9 volt battery or battery packs with the same clip
• Plastic ring protects positive terminal from accidental ground connections

Features:

• 9V Battery Clip to DC Plug 2.1 x 5.5 mm Tip Positive 5" Adapter Cord
• Plug Type: 2.1 x 5.5mm Male to 9V Battery Clip
• Material(External): Plastic
• Color: Black, Red; Weight: 10g
• Cable Length: 12cm/4.7''
• Feature: T-type Connector;
• Buckle Size: 26 x 19 x 5mm/1" x 0.75" x 0.2"

Note:Battery packs with 9 volt clips come in a variety of voltages. So if your product requires 12 volts DC you can get a battery pack that holds eight AA batteries. The more amps your product uses the faster the batteries will run down. Rechargeable batteries work great for this situation because you don't have to through them away when they run down.
Caution:

• Make sure you DC jack is tip positive. Electronics that draw more than 2 amps can overheat AA batteries.