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How to distinguish between Lithium-ion and Lithium Polymer cell

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Wilson__:
Many thanks.  The grey plastic pouch cell are 'universally' used in device with hard casing. 

What chemistry are mostly used for watch and wearable (fitbit type)?

Seem LCO has highest energy at 200 Wh/kg and 400 Wh per litre.   LMO is 150 and 350 respectively.

TIA

Siwastaja:

--- Quote from: Wilson__ on May 30, 2024, 10:25:39 am ---Seem LCO has highest energy at 200 Wh/kg and 400 Wh per litre.   LMO is 150 and 350 respectively.

--- End quote ---

It's funny how stuff like this, written in 2005 or something, still pops up.

LCO went beyond 200Wh/kg and while probably still available, has been mostly superseded by other chemistries like NCA, NMC and whatnot. NCA specifically is said to be of highest energy density, but nothing is clear-cut like that. Chemistries have subtleties. All that matters is, what cells are commercially available to buy, and what are their actual specifications. You might not even know what the chemistry is.

amyk:
These days the majority of cells are likely to be NMC.

BILLPOD:
Good Morning Wilson, by the term Lithium Polymer, could you have meant
 LiFePO4 batteries :-//

salihkanber:
Are you sure of the mah capacity of 50-100? Regularly its around 300mah. Afaik 4 smaller sizes and form factors, pouch cells are commonly used. Addition to that, you can go for rechargeable coin cells such as: Citizen MT920, or search for other ready-made smart watch batteries as spare parts.

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