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I am not familiar with a "free" battery, but one might be available through your diabetic supply company. The battery is a CR2032 which is available at many stores, try WalMart CVS or your local drug store.
E5 codekey expired which means that the test strips or out of date and no longer any good. You get a new codekey with a new can of test strips. A pain, I know.
E1 Re Insert test strip
E2 Incorrect code key
E3 Extremely high reading
E4 Not enough blood on test strip
E6 Control Solution too soon?
E7 Electronic error
E8 Temperature too high
E9 Change Battery.