Canon NP-E3 Battery review

A spare Canon NP-E3 Battery Pack is a key issue in the Canon EOS 1Ds Mark II, Canon EOS 1D Mark II, EOS 1D or EOS 1Ds kit.
Since the Canon NP-E3 NiMH battery is, care must be taken to maximize battery capacity and life. Ni-MH requires less attention than NiCad batteries, but is not as careful as free lithium-ion batteries.
Chuck WESTFALL, Assistant Director / technical report Department Division camera / USA Canon Inc., Canon recommends implementing a new NP-E3 Battery Pack through 3 or 4 complete discharge / recharge before they complete cycles of normal use (or during the initial use). This procedure will maximize the capacity of the battery.
The Canon NP-E3 battery discharge / recharge complete the cycle performed in the Canon charger takes about 8.5 hours for the discharge cycle closer to 2 hours to complete a charge. The overnight is a good time to do this - is 10.5 hours long.
Chuck WESTFALL also added more information to professionals - a professional meeting in general the following characteristics: owns 2 or 3 batteries, uses his camera at least 5 days per week and an average of at least 1000 shots per week. The Canon NP-E3 Battery Pack for maintaining a professional recommendation is to refurbish each battery about once a month after the first conditioning.
Chuck also stresses that this is a guideline - not a requirement. Styles individual shooting may dictate setting of this recommendation.
My recommendation is to have at least two Canon NP-E3 Battery Packs. Keep one in the chamber until completely exhausted, keep the other (s) fully loaded into your bag - ready for immediate use. You are basically battery giving each of unloading / loading cycle each use.