So I finally bought these Sanyo Eneloop rechargeable batteries for my Canon SX10 IS Cameras. I talked about this before and the biggest problem camera users have with rechargeable batteries is the the self-discharge rate. I have find most types of rechargeable batteries discharge within 2-3 days and I have 8 rechargeable batteries from a reputed brand drop downs to zero with 24 hours.
There are 2 types of Sanyo Eneloop rechargeable batteries. First generation which is old batteries and Second generation batteries which are Sanyo's latest type rechargeable batteries. First-gen Eneloop AA cells have "Type 2000mAh, Min 1900mAh" printed on them, while 2nd-gen Eneloop AA battery cells only say " Min 1900mAh "but in fact they have the same capacity rating of 2000mAh.The 2nd-gen Eneloop claims to "recharge up to 1500 cycles", while the original only claims 1000 cycles. It's not going to matter a lot unless you are heavy user of these batteries like if you recharge those daily.
It's if you need good batteries for your Canon SX10 or Canon SX20 Camera which will keep power more than 2-3 days then it's better to have 2-3 packs of these batteries. Specially if you are going on vacation a far away place where you might not able to get your batteries charged.