Mommalyze - With a P&S camera you're actually much better off with 2 or 4 AAs - if you do it properly - than with a Li-Ion power-pack.
You've probably just used the 2 x AA Alkalines Canon supplies in the pack... With not very good results. Because of the "3 x AA options" - Alkalines are the worst. I have 3 Bridge-Zooms that use 4 x AAs each - and yes - in the back pocket of the bag, there's a chain-store cardboard strip of AA-Alkalines - for "desperate-emergency" use, only!
Otherwise all 3 run on AA-Eneloops - the Canon SX10 gets 550-600 shots per charged set - the "battery-hogging" Fuji HS10 gets about 450+, so on. The old Fuji S2000HD usually isn't along on photo outings - it lives in the end pocket of my shopping-etc carry-bag as a snaps-camera - and gets about 400 on Eneloops.
I have 5 sets of 4 x AA-Eneloops - the 2 'main use' cameras have 2 sets each - usually plenty of power for a weekend or few days away. And of course - unlike having Li-Ions - the 4 sets with the cameras can be rotated through either SX10 or HS10.
If doing a lot of HD video with the HS10 unexpectedly - the "SX10's" sets of Eneloops can be used in the HS10 - and if needs be - the SX10 can run on Alkalines from the 12 on the 'emergency' card strip - it only gets 350 shots on Alkies - under 300 if some Flash is used - and
thaaat's getting down into "Li-Ion" pack territory - pretty slack!
Check the numbers of shots the Li-Ion power-pack Bridge Cameras do - compared with those using 4 x AAs - with Eneloop option.
Canon lost a LOT of Bridgey-Users by putting the "trendy" and penny-dreadful Li-Ions into the SX30 and SX40... The SX30 has a tiny Li-Ion NB-7L that in actual use gives about 320 shots, no flash... Many Users complained - and the SX40 has a "much bigger" NB-10L Li-Ion that that gives a "massive" 360 shots in use, no flash... Great - except the SX10 and SX20 doing 550-600 shots on Eneloops make both of 'em look "trendy-silly"....
Oh - and if you were going into a remote area - backpacking, or into a country with few facilities - if your camera uses AAs - you could lay-in a stock of AA-Lithiums - lighter than Alkalines or rechargeables - and I can witness that in an SX10, Eveready Energizer Ultimate Lithiums (Sydney, $14.00, pack of 4) - will run an SX10 1,122 and 1,039 shots - second set included 28 shots flash at mid setting) - only tried 2 sets (experiment on another forum, actually - I didn't believe an SX10 would do "waaay-over" over 1,000 shots on them - and I lost the bet!)
As for smaller cameras - compare the Canon A1200 and A2200. These are almost identical entry-level P&S cameras. The A1200 has a Viewfinder and runs on 2 x AAs. My godson recently was given one (he asked me and I helped him choose it, gift had "about $100.00" limit, from his Gran) - got 330 shots on the Canon Alkalines supplied with it.
He changed to Eneloops (the Fuji S1800 I bought him some time back, is of course a 4 x AAs device...) - and immediately got over 500 shots on a charge... He experimented a bit - and now says the LCD is a "battery basher" - as, viewfinder only, he can get just under or over 600 shots - LCD only - about 400-425 - and "using both" - LCD on tripod for the HD video, so on - about 500.
Oh - the very similar, but no-viewfinder, A2200 - claimed 280, Reviews say "250 or so, without flash" - from its tiny Li-Ion...
If the Makers are going to continue this "no-viewfinder" P&S trend - have larger and power-munching LCDs as the only aiming-option- and also insist on under-powering them with tiny Li-Ions - they might think of copying their DSLR Departments - where cameras, even with large "Professional" capacity Li-Ions - do have "grips" that can be stuffed-full of AAs - and as they say - Eneloops, preferaby...
Now - let's see - with the SX50 - will Canon make Li-Ion exchangeable with an optional 4 x AAs holder that replaces the wimpy power-pack? Quite "do-able" - as in the physically about same size K-R DSLR - Pentax does exactly that. Or - will Canon provide an AAs-carrying "Grip" for the SX50...
They'll need to do "something" - because if I was buying a newer Bridge Camera right now - apart from Fuji's HS20 (I have the HS10, and won't buy the downgraded HS20) - every brand has Li-Ions... And if I was going to be stuck with a Li-Ion camera - the Panny FZ150 cooks the SX40 for JPEG and RAW IQ, HD video, 12fps and saves 12 images Continuous - and the 1,020mm equiv optical reach does have attractions....
Regards, Dave.