I purchased a Digital Camera Battery Pack from
http://www.terascout.com/canon.html?Q
The Battery pack overheated when I attempted to charge it.  Case became so
hot it warped.  Would not take full charge.  Does not get me 20% of the
photos the old half dead pack delivers.  What a dud.  Wrote e-mail for
exchange.  No response.  My advice is to try  a different supplier.
Cheers,
Wayne