# I fried my OG Pocket Piano - SOLVED

**URL:** <https://forum.critterandguitari.com/t/i-fried-my-og-pocket-piano-solved/11014>\
**Category:** Pocket Piano / Bolsa Bass / Original Kaleidoloop\
**Created:** [May 17, 2025, 3:39pm UTC](https://forum.critterandguitari.com/t/i-fried-my-og-pocket-piano-solved/11014 "2025-05-17T15:39:06Z")\
**Posts on this page:** 5\
**Page:** 1

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**Author:** ![MortalPortal](https://avatars.discourse-cdn.com/v4/letter/m/edb3f5/32.png) [@MortalPortal](https://forum.critterandguitari.com/u/MortalPortal)\
**Post date:** [May 17, 2025, 3:39pm UTC](https://forum.critterandguitari.com/t/i-fried-my-og-pocket-piano-solved/11014/1 "2025-05-17T15:39:06Z")

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With a Lithium Ion rechargeable battery.

To make it worse, I made the same mistake with my also now-defunct Bastl Microgranny. I discovered both of them dead on the same day. I’m so heartbroken - they were my two first microsynths and always my favorite of all time.

Any idea if it would be hard to repair? Or worth it? I really wish you still made them as well as the 201.

Thanks,  
Jonathon

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**Author:** ![chrisk](https://yyz1.discourse-cdn.com/flex035/user_avatar/forum.critterandguitari.com/chrisk/32/11_2.png) [@chrisk](https://forum.critterandguitari.com/u/chrisk)\
**Post date:** [May 19, 2025, 7:52pm UTC](https://forum.critterandguitari.com/t/i-fried-my-og-pocket-piano-solved/11014/2 "2025-05-19T19:52:51Z")

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Sorry to hear this. Do you have a power supply you can try to power the Pocket Piano? The required specs are:

- 9VDC
- minimum 300mA
- 2.1mm tip with center-positive polarity

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<div class="post-metadata">

**Author:** ![MortalPortal](https://avatars.discourse-cdn.com/v4/letter/m/edb3f5/32.png) [@MortalPortal](https://forum.critterandguitari.com/u/MortalPortal)\
**Post date:** [May 23, 2025, 10:45am UTC](https://forum.critterandguitari.com/t/i-fried-my-og-pocket-piano-solved/11014/3 "2025-05-23T10:45:38Z")

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Yeah. One Spot standard 9v power supply like for guitar pedals. Nothing worked. I’m wondering if it was the Lithium-Ion nature or the high mA (1000) that did it. I’m guessing the latter?

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**Author:** ![chrisk](https://yyz1.discourse-cdn.com/flex035/user_avatar/forum.critterandguitari.com/chrisk/32/11_2.png) [@chrisk](https://forum.critterandguitari.com/u/chrisk)\
**Post date:** [May 23, 2025, 5:36pm UTC](https://forum.critterandguitari.com/t/i-fried-my-og-pocket-piano-solved/11014/4 "2025-05-23T17:36:30Z")

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‘One Spot’ power supplies typically have a tip with center-negative polarity. The Pocket Piano requires a tip with center-positive polarity (diagram below):  
[![](https://canada1.discourse-cdn.com/flex035/uploads/critterandguitari/original/2X/a/a1fbd184a3448281c41244100da3fab4d0ff1738.png) ](https://canada1.discourse-cdn.com/flex035/uploads/critterandguitari/original/2X/a/a1fbd184a3448281c41244100da3fab4d0ff1738.png)

One Spot makes a polarity reverser for this use case.

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<div class="post-metadata">

**Author:** ![MortalPortal](https://avatars.discourse-cdn.com/v4/letter/m/edb3f5/32.png) [@MortalPortal](https://forum.critterandguitari.com/u/MortalPortal)\
**Post date:** [May 24, 2025, 9:17am UTC](https://forum.critterandguitari.com/t/i-fried-my-og-pocket-piano-solved/11014/6 "2025-05-24T09:17:36Z")

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It worked! And as it turns out, all 3 of the batteries I tried were dead - it’s not the devices! Derp. They must have gotten put in the “fresh” pile mistakenly. Whew - huge relief! Thank you!