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LiPoly safe for wearables for kids?
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LiPoly safe for wearables for kids?

by ChrisW42 on Sun May 31, 2020 9:24 am

Hi,

I’m building wearables with my kids, a 10 year old daughter and an 8 year old son. She wants to build a fabric heart shaped necklace with distance sensor, he wants sunglasses with Knight Rider effect.

Using a LiPoly battery seems the obvious choice for both projects. But is that safe enough? Would it help to put the batteries in small 3D printed cases?

ChrisW42
 
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Joined: Sun May 31, 2020 6:33 am

Re: LiPoly safe for wearables for kids?

by adafruit_support_bill on Sun May 31, 2020 12:07 pm

Alkaline or NiMH cells are the safest power sources - although somewhat bulkier than LiPo. To minimize the risks of LiPo powered projects:

* Use the smallest capacity cell that will do the job.
* Use cells with integral protection circuits.
* Take care to protect the cell against physical damage and electrical stress.
* Make sure that any wearables containing the cell are easily removed in the event of a problem.

A 3D printed 'hard-shell' case for protection of the cell is a good idea. Aside from physical damage, the primary dangers with LiPo cells are unsafe charge and discharge conditions. You will want to choose a charger with a charge-rate at or below the "standard" charge rate for the cell. You will also want to thoroughly review your design & build for any risk of a short circuit that could result in exceeding the maximum safe discharge rate.

All of the cells we carry are equipped with integral protection circuits. But a sudden problem like a dead-short can stress the cell before the protection circuit has time to react.

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Please be positive and constructive with your questions and comments.