Using a Pro-Find 35 without a 9V battery

[mh9162013]

If you've read some of my posts, you know I hate 9V batteries. I finally finished a working prototype of a 9V voltage booster so I can use a rechargeable LiPo in my Pro-Find 35. Here are a few pics:



Based on indoor testing, the performance exceeds the stock 9V battery. If you want to learn more, I have a blog post, but I'm not sure if I can post the link here.

I was hoping to use loose AAA cells for this, but it would require permanent modification of the end cap and I'm not ready to do that yet.

 

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[Darke]

Looks good. No heat problems with the boost converter? You can add 9v pin terminals and wrap it to make it completely drop in.

 

[mh9162013]

Looks good. No heat problems with the boost converter? You can add 9v pin terminals and wrap it to make it completely drop in.

None for the few minutes I was using it buzzing it with metal objects constantly. But when I do more testing, I'll pay attention to that. Thanks for your feedback!

 

[Professor of Engineering]

Very nice modification!

 

[mh9162013]

Very nice modification!

Thanks!

 

[mh9162013]

Cleaned up the booster a little:

 

[HooDoo]

I realize this is an old post but was wondering how this mod held up/preformed.

 

[mh9162013]

I realize this is an old post but was wondering how this mod held up/preformed.

It's hard to say.

I ended up selling my Pro-Find 35 and keeping my Garrett Carrot due to the ease in which the latter can be modded.

Currently, I run this adapter (with a few tweaks) in my Garrett Carrot and it works just fine. Put about a hundred hours on it in real world use and testing and it's still going strong. Also, I don't use it with a lithium battery pack. Rather, I use it with 3 AAA cells. See the pics below: