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searched the forum...
did not find a definitive answer.
so...i am using 1D mkIIs' for backups.
what is the best after market replacement
for mp-e3 batteries?
Well, if you searched for 'MP-E3' batteries, you likely got zero results because it's actually an 'NP-E3' battery.
In any case, My Lenmar replacements are fantastic on my 1D…I recently shot a 4,000 entry race event on two batteries (never actually having completely exhausted either battery)