Last minute mini-LED lighting

Flashlight Modding and DIY Parts
1

I am curious to avoid some pitfalls with this project.

I need to make some tiny leds that are battery powered. They (hopefully) will fit under a pair of rollerskates and light things up. :slight_smile: Ideally, they should run for 3-4hrs without problem.

So, I have some regular white leds, but also some smd5050 led light strips. You can cut those off at 3 leds, and they are perfect for 12v input. However, seems to be somewhat hard to find a tiny battery that does 12v.

It seems I could get cr2016, cr2025, or cr2032 and stack them to get 12v. I could also desolder the smd5050 chips and then it would cut the voltage requirement down to 3-4v. Anyone know if a single cr2032 would then work without any resistors needed? I know the keychain leds typically go this route, as the cr20 batteries have a higher internal resistance.

I need to get all this done by next sunday. I was thinking of getting some cr batteries on amazon prime so i get them in two days. That way I could do some experimentation. I’m not set on those, but they seem they would fit and are cheap. It is hard to find any good info on stats for those smaller batteries (mah ratings, etc.)

thanks for any guidance.

2

There is a small 12V battery that is commonly used in electronic butane lighters, car alarms, and key fobs. Look for: MN27/MS27 GP27A V27GA L828 A27

3

thanks. I’ll look into that. I didn’t mention the other issue, which to a certain extent is cost. Some of those higher voltage batteries are quite pricey.

I’ve never found anything rechargeable at all either. Not really expecting this, though.

4

You can find those for around $1 They are small (8mm diam) and contain a stack of 8 tiny coin cell type batteries. The MN27 is around 18 mAh. There is a larger (10mm) diameter MN21 cell that is around 33 mAh.