Many of our consultants who are physically disabled are unable to dress or undress without aid. This suggests that Lithium batteries shouldn’t be built into their wearables as there isn’t an easy way to mitigate against the rare occasion in which the battery catches fire.
These sorts of safety concerns are why the Adafruit Gemma and Flora wearable platforms don’t include LiPo chargers and they encourage the use of NiMH or Alkaline batteries.
SparkFun, on the other hand, builds LiPo chargers into their LilyPad platforms. Presumably, they assume you are going to follow some of the recommendations here: https://learn.sparkfun.com/tutorials/lilypad-basics-powering-your-project.
The safety advice offered in both these sources is inadequate and you should consult a professional engineer and an organization like UL before proceeding: https://www.ul.com/consumer-technology/wp-content/uploads/2017/07/WP_TestingBatterySystemsDesignedForWearableTechnologies_15.pdf
The Flexibility Kit microcontroller baseboard includes neither a charger or the popular JST connector Adafruit and Sparkfun have popularized for battery connections.
2 comments on “Safer Power Options for Wearables”
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Here is another battery engineering testing service with links to the UL and european regulations: https://www.astm.org/COMMIT/images/Grimes-SGS_NA_ASTM_presentation_20160624.pdf
Adafruit suggests that LiPo batteries can be wrapped in gaffer tape for applications such as wearable electronic earrings. It is tempting to recommend that if you decide to do this at least use flammability tested gaffer tape, e.g., http://www.gaffatape.com/gaf-fire/default.aspx. This is BAD reasoning though. Safety does not come about from choice of materials alone. It is arrived at by testing and engineering of the entire system.