1s to 2s lipo inside product.

[Twinstaged]

I’ve been lurking around here for years.  First post.  Thanks for any comments/criticisms.

Designing a re placement rear cover for a product that increases battery life and is rechargeable.  The cover holds 2 UN certified “protected” 1s 2000mah lipo packs.  They plug into a series harness that leads to a balance 2s 15w charger.  From the charger is a standard 9 volt clip that leaves the case.  Does this now create an issue with the UN38.3 cert?  I’ve heard mixed opinions.  Pictures shows 1 of the prototypes.

[quince]

You'll need to remember that your customers are always welcome to sue you if it burns down their property or injures anyone.

[Twinstaged]

Yep absolutely lol.  That same liability has not stopped companies from selling products.  They follow the same rules that I am trying to follow.

[Twinstaged]

So I’ve been doing some more research on this.  The seperate cells/modules have passed the required tests.  If I can verify that my assembly cannot overcharge, short circuit, or over discharge the batteries then everything should be fine with the original 38.3.  If I can’t verify that then the new assembly would need re tested under 38.3.3.1.

Any experts on the matter?

[quince]

Since this is a proprietary product you're building, I would not expect people to do legwork regarding regulations & certifications for you for free. There may be people at the Underwriters Laboratory who can help you.

[Phil1977]

If you are mainly thinking of certifications, then an internet forum really is not the right place to get help. Regarding liability you need information that is liable for you - and that´s nothing you can get here.

Anyhow, I think this is a very constructive forum here, so let´s keep it that way: I know the US is not like Europe, but usually you find ways to bring a useful product to the people. Why don't you sell the housing design on a 3D-print-platform together with the BOM for the batteries and the charger? I´m no lawyer, I don't think this removes ALL responsibility from you but I assume it takes it to a reasonable level.

Of course, you can't earn big money that way. But there´s nothing like a free lunch...

[Twinstaged]

I’m not asking for anyone to do any leg work on my behalf for free.  Just asking the experiences of others that have gone down this road.  If the answer was a clear “ that would need recerted” then I would already know how many I would need to build and about how much it would cost to send them off to a testing lab.  My whole this in this more to keep things in line for the product to be shipped easily.  Opening my business to liability is apart of business. 

I definitely did think about selling the 3d printed cases with a BOB, but the focus is to sell plug and play solutions.

I appreciate the responses.  I’m still tweaking things and when the time is right I’ll reach out to the battery manufacturer for a response.