Anyone ever compare the performance of they're STK batteries to the Canon batteries ? I have always read how the STK's last as long or longer than the Canon's but I'm not seeing that with the ones I just got. Running a new STK alongside a 4 year old Canon with low recharge performance (one red bar showing) in a battery grip, I took about 800 shots. Canon showed 59% charge the STK 36%. Both batteries had a 100% charge from the factory canon charger. The STK is rated at 2600mAh the Canon 1800mAh.