convert DSi store unit to retail

So I've got this dsi that i think it was used in a store.
It acts like this:
It doesn't charge the battery even if the orange led is on.
The console is powered off and when I connect a charger it turns on by itself. If i remove the charger the console turns off.
If I use a fully charged battery, the console sees it as a discharged one (only one red line of power left).
The are no differences in case or in menu compared to a retail one.

I formatted the console and made an update from 1.2E to 1.4.5E - no difference.

Is it possible to make it work on a battery like a retail one? Without replacing the motherboard with a retail one.
Thank you.

 

Don't think so. If the firmware flash didn't help, I am not sure what would. MAYBE (just maybe) there is some sort of circuit or solder blob that Nintendo put on to turn it into a Store unit. But why not just swap the mainboard? They're only $23 on eBay.

 

Thank you for your answer.
I'll open and see if i can find some differences. If not i'll swap the motherboard because i have a spare one.
PS: 23usd it's too expensive just for the motherboard.

 

I would keep it as it is. It is a curiosity and certainly more collectible and far less common than a standard DSi console.
I have a 3DS XL that is a store display model and it behaves in the same way regarding the battery.

 

Well, I opened the console. No difference in motherboard. I found a retail motherboard with the damaged cart slot and i swaped the motherboards and now the console is working properly. I also removed the cart slot from the store unit and place it on the reail motherboard.
Ergot_Cholera: I don't see why a store unit will be collectible. It's a standard console that doesn't work on battery. At least it should have a text printed on the case like: store display, test, etc.
PS: I think I also have a 3ds xl store unit in the mail.

 

the no battery part may be as simple as a jumper (as mentioned) or a diode.
If you want pop up a high res pic of both sides of the mobo

 

Not the same but in store unit Wii controllers, the + battery spring is gone and a wire is in it's place which then goes to the Wiimote's accesory port and it gets its power source from there. Could be something somewhat similar on the DSi to make it run off a power source other than the battery.

 

Thank you, guys. I will post a picture of the motherboard when I get home from work.
I've only replaced the motherboard, not the the power board (the one with the fuse) or the wi-fi module. So for sure there's something different with the main motherboard.

PS: I don't think it's a jumper because the console will not power on without a battery. It needs the battery and the charger at the same time.

 

I made it work on a battery., but it doesn't charge. The orange led blinks like when the battery it's not connected.
For anyone who wants to do that, here's a picture of a retail motherboard:
https://dsibrew.org/w/images/d/d8/Twl_front.jpg

Under the cart slot, on the right side you can see 3 components are missing. Remove those from the store/demo motherboard. They are labeled: C109, Q15 and Q14.