SD-Card not working on Teensy 3.5 with LiPo Battery

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pocolocos

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Hi,
if I connect my Teensy 3.5 to a 3,7V LiPo Battery (1000mAh) "card.begin" fails (testing with SdFormatter example) with
"SD error: 40,10001" or "SD error: 43,20001".
When connecting the Teensy to USB-Power everything is fine.
Also tried to reduce CPU-speed of Teensy - but without success.
Any suggestions?

P.S.: Apologize in advance if I don't follow some rules of this forum - this is my first post.
 
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