Why are UNprotected RCR2 cells lower capacity than Protected?

FlashMike

Newly Enlightened
Joined
Dec 2, 2005
Messages
42
Location
California, USA
I'm going to need some RCR2 (rechargeable CR2) batteries. I currently use both protected and unprotected RCR123's. I accept that the protected RCR123 cells cost more and have slightly lower capacity (800mAh vs 750mAh are the best cells I have found).

So why, for the RCR2's, do the protected cells seem to have GREATER capacity. I have checked in a couple places on CPF and keep seeing the unprotected RCR2 listed as 300mAh, while the protected cell is 350mAh. How does the cell lose some volume to protection circuitry and still end up with a higher capacity?
 

AW

Newly Enlightened
Joined
Oct 15, 2004
Messages
33
Location
Hong Kong
The capacity of a LiIon cell depends on the amount of electrolyte inside the cell and how they roll the separators during the manufacturing process. A more densely rolled cell will have more capacity than a loosely rolled cell. A factory with the right equipment and technology will produce a higher capacity cell. That is the exact same reason you see the latest 18650 is 2600mAH whereas some 18650s are still 2000mAH.

AW
 

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