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E31 is a programming error code. Most of the time this comes from using non-alkaline batteries or from letting a battery die in the unit. "lob" means low battery condition. In these rangefinders "lob" will show up with a new non-alkaline battery installed. Non-alkaline batteries just don't generate enough current for the laser to operate properly. Reprogramming costs about 20 bucks, if it needs an alignment (won't hit a flag or target at 200+ yards >50 bucks<) Oily looking spots in the display are from not using the eyepiece cap and direct sunlight damages the LCD. (15bucks) The address for repair is:
Bushnell Repair Center 8500 Marshall Drive Lenexa, KS 66214
800.423.3537 Send a problem statement, your phone number, and $10 for return shipping.
It sounds like the 9volt battery connector has a broken wire. You maybe able to have it resoldered or send it to Bushnell for repair. If you take upon yourself to open the unit up....You could void your warranty. If it is under 2 years old from the date of purchase, its under warranty. Call Bushnell at 800.423.3537 and ask them. They might have you send it in and replace the unit with a new one.