About 3 weeks ago, I got my battery shield, plugged it in and it charged the battery. I tested it on a Spark and it worked so I put it aside. So today I pull it out, the battery is dead so I charge it with the shield and the DONE light comes on. When I try to plug it to a Spark, there is no power. I plugged the batter on a SeedStudio Lipo Rider Pro I have and it worked just fine powering the Spark. So the shield charges but does not power. That is the ultimate in power saving! What’s my next step?
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Hey @peekay123! Have a look over here 
Might be the fix?
Thanks BDub! Unfortunately I have the modified shield 
Here is a excellent battery solution for the Spark Core.
I have tested these thoroughly and they work great and for the money they a really good deal. This what I have been running my Spark Core on for days straight.
They can be quickly recharged at 2 amps which is really nice.
This will run the spark core for about 80 hours http://www.amazon.com/External-Battery-Pack-Limefuel-L130X/dp/B00BZD6QCW/ref=sr_1_2?ie=UTF8&qid=1393385577&sr=8-2&keywords=limeaid
And they have larger versions also: http://www.amazon.com/External-Battery-Pack-L180X-Thunderbolt/dp/B00C78YJQY/ref=sr_1_3?ie=UTF8&qid=1393385577&sr=8-3&keywords=limeaid
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RWB, I appreciate the info! However, it doesn’t fix my lemon shield. Frankly, I never liked the mustache and I am waiting for Mr. timb’s shield. 
@peekay123 I’m waiting for Tim’s shield also but for now if you want to get the Spark Core away from the power outlet those batteries are the best deal I have found to date.
@peekay123 As a test, could you plug the battery and the USB cable together when you connect it to the Core and report what happens?
Mohit, when I plug everything in, the battery indicates its charging, the large chip on the shield gets HOT and the core does NOT power up.