# My Battery Powered Quad Cortex! **URL:** \ **Category:** Quad Cortex\ **Tags:** quad-cortex\ **Created:** [December 31, 2023, 6:56am UTC](https://unity.neuraldsp.com/t/my-battery-powered-quad-cortex/12974 "2023-12-31T06:56:57Z")\ **Posts on this page:** 9\ **Page:** 4
**Author:** ![CloseProximity](https://avatars.discourse-cdn.com/v4/letter/c/6a8cbe/32.png) [@CloseProximity](https://unity.neuraldsp.com/u/CloseProximity)\ **Post date:** [October 28, 2025, 1:55pm UTC](https://unity.neuraldsp.com/t/my-battery-powered-quad-cortex/12974/62 "2025-10-28T13:55:23Z")
Sounds to me like you need to reverse the polarity of the cable. ---
**Author:** ![wthinavl](https://avatars.discourse-cdn.com/v4/letter/w/b5e925/32.png) [@wthinavl](https://unity.neuraldsp.com/u/wthinavl)\ **Post date:** [October 28, 2025, 1:56pm UTC](https://unity.neuraldsp.com/t/my-battery-powered-quad-cortex/12974/63 "2025-10-28T13:56:14Z")
Yeah, I couldn’t get the Krisdonia to work. Had to return it. I dont recommend running on 9v. I also got mine to power up with 9v, but the output levels were compromised. Enough voltage to power the CPU, it not enough to power the line level output. Good luck. FWIW, the Talent cell allows you to run any combination of power outlets simultaneously. I actually run my tuner in a battery, but considering a switch to one of the additional outlets. ---
**Author:** ![CloseProximity](https://avatars.discourse-cdn.com/v4/letter/c/6a8cbe/32.png) [@CloseProximity](https://unity.neuraldsp.com/u/CloseProximity)\ **Post date:** [October 28, 2025, 1:56pm UTC](https://unity.neuraldsp.com/t/my-battery-powered-quad-cortex/12974/64 "2025-10-28T13:56:23Z")
I don’t use the DC out. I use a USB-C to DC adaptor, which reverses the polarity. ---
**Author:** ![webster27](https://avatars.discourse-cdn.com/v4/letter/w/8e8cbc/32.png) [@webster27](https://unity.neuraldsp.com/u/webster27)\ **Post date:** [October 28, 2025, 3:16pm UTC](https://unity.neuraldsp.com/t/my-battery-powered-quad-cortex/12974/65 "2025-10-28T15:16:38Z")
I already did all the tests, the polarity is correct! ---
**Author:** ![webster27](https://avatars.discourse-cdn.com/v4/letter/w/8e8cbc/32.png) [@webster27](https://unity.neuraldsp.com/u/webster27)\ **Post date:** [October 28, 2025, 3:18pm UTC](https://unity.neuraldsp.com/t/my-battery-powered-quad-cortex/12974/66 "2025-10-28T15:18:35Z")
I think I’ll return this Krisdonia too and go for a classic power supply ---
**Author:** ![CloseProximity](https://avatars.discourse-cdn.com/v4/letter/c/6a8cbe/32.png) [@CloseProximity](https://unity.neuraldsp.com/u/CloseProximity)\ **Post date:** [October 28, 2025, 4:05pm UTC](https://unity.neuraldsp.com/t/my-battery-powered-quad-cortex/12974/67 "2025-10-28T16:05:56Z")
Suit yourself. I haven’t had a single probem since buying it in 2023. ---
**Author:** ![CloseProximity](https://avatars.discourse-cdn.com/v4/letter/c/6a8cbe/32.png) [@CloseProximity](https://unity.neuraldsp.com/u/CloseProximity)\ **Post date:** [October 28, 2025, 4:06pm UTC](https://unity.neuraldsp.com/t/my-battery-powered-quad-cortex/12974/68 "2025-10-28T16:06:57Z")
[https://www.amazon.com/s?k=DC+to+usb+C&page=2&xpid=EHSRHzrSXcmLs&crid=21TZSQROGTAFI&qid=1761667576&sprefix=dc+to+usb+%2Caps%2C197&ref=sr\_pg\_2](https://www.amazon.com/s?k=DC+to+usb+C&page=2&xpid=EHSRHzrSXcmLs&crid=21TZSQROGTAFI&qid=1761667576&sprefix=dc+to+usb+%2Caps%2C197&ref=sr_pg_2) This is the cable I’m using. ---
**Author:** ![wthinavl](https://avatars.discourse-cdn.com/v4/letter/w/b5e925/32.png) [@wthinavl](https://unity.neuraldsp.com/u/wthinavl)\ **Post date:** [October 28, 2025, 8:52pm UTC](https://unity.neuraldsp.com/t/my-battery-powered-quad-cortex/12974/69 "2025-10-28T20:52:42Z")
I don’t think its working on the newer models. I tried several different cabling methods and could not get it to work. Only in the 9v setting which compromised the output levels. YMMV. ---
**Author:** ![sliberty](https://avatars.discourse-cdn.com/v4/letter/s/90db22/32.png) [@sliberty](https://unity.neuraldsp.com/u/sliberty)\ **Post date:** [October 30, 2025, 12:03am UTC](https://unity.neuraldsp.com/t/my-battery-powered-quad-cortex/12974/70 "2025-10-30T00:03:20Z")
After powering the QC for 2.5 hours, the battery read 58% remaining. I can live with that easily. [Previous page](https://unity.neuraldsp.com/t/my-battery-powered-quad-cortex/12974.md?page=3)