Chamberlain LIFTMASTER Professional # 475LM Battery Back-up     This item works with LiftMaster ® Garage Door Opener models 2500, 3500, and 3800.    Operates the garage door opener as if the power is still on. (All safety and security features still operate normally)    An audible signal sounds when door is operating under this battery power.   Bright LED lights let you know when the EverCharge™ is charging, or in use, or when the battery need to be replaced.   Battery is inside a custom cover with LED lights, protecting the battery & allowing your garage ceiling area to still look neat.   Imagine coming home during a bad thunderstorm only to find your electric is out & you must get out of your car to manually open the garage door.  Now imagine being able to still raise the garage door even with the electric knocked out, while you stay nice & dry.  Cool huh ?   That's just what this back-up battery does.  It mounts on your Liftmaster opener, or it mounts onto a nearby ceiling joist.  Plug it into the door opener and it starts charging.  Once charged this battery is always ready to run your garage door opener, even when you have no power.    BRAND NEW in ORIGINAL BOX as shown in my photo.  Never opened, never removed from box.   Includes an instruction manual.  I will be shipping this unit just as you see in the 1st photo, with extra tape & a shipping label attached.   Go to www.liftmaster.com for even more details.   Please Note:  This item was originally a Commercial sold only item, not available to the public directly.  Having not been manufactured in a couple years, the batteries inside these units have never been charged.  They only have about a 4-6 year lifespan, before needing to be replaced.  The units retail for $ 256.95 with the 2 batteries inside.  Please know the batteries inside these units may last a few years, or may need immediate replacement.  The replacements are easy to obtain & replace, being a  12volt 4.5 amp Battery.  Please bid accordingly knowing these units have batteries inside them that might be on the downhill of their lifespans.   I took a picture of the Unit out of the box, and I took a picture of it opened up with a battery removed, so you can see the type of battery that will be used when it's time to replace them.  Each unit requires 2 batteries.  The Official Chamberlain number is 41B591 and you can call 1-800-528-2817 to purchase a factory replacement part.  All this info is listed in the included instructions.

****   Frequently Asked Questions:   Is this item chain driven or belt driven ?        NEITHER, it is NOT a garage door opener.         Is this item 1/2 hp or 1 hp ?                             NEITHER, it is NOT a garage door opener.         Is this item a garage door opener ?      NO, it is NOT a garage door opener.  

This Item comes from my personal Collection.  These Items have been carefully inspected by me.  All items from a Smoke-Free home. Feel free to E-mail me with any questions.

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