Hello! In this article, I will be showing you how to install your own APC replacement battery into the BK650MC APC backups unit. The installation is pretty simple to do, and is not to be considered very time consuming. The BK650MC replacement battery that we will be installing into the unit is a 12v 12 amp hour sealed lead acid battery, which is commonly referred to as the RBC4 battery (APC's official name for it).
Alright, in order to get started you will need to unhook the unit from any power source. I would also recommend disconnecting everything from the back of the unit as well to avoid any unexpected electrical spikes when we are installing our APC replacement battery. The battery is only accessible from the very bottom of the unit. If you flip your Smart-UPS 650 over, you will see a metal latch with two small screws that secure it too the BK650MC's frame. Once these screws are removed from the USP, you should be able to pull the latch open to reveal the spent APC RBC4 battery.
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To remove the battery, simply slide out the old RBC4 battery unit you can see the two spade connectors that are hooked up to the battery's terminal. Once you can see them, carefully remove each wire, beginning with the negative spade terminal first. Once the wires are off you can simply pull the old RBC4 battery out of the unit.
To hook up your RBC4 replacement battery, simply position the battery inside the battery compartment far enough in so that you have enough slack with the positive and negative wires to connect them to the battery. I always recommend connecting the positive wire first, to avoid any unwanted sparks! Once you have successfully hooked up your RBC4 battery to the unit, simply close the metal latch and secure it down with the two screws we took out earlier. You have just installed your own APC replacement battery!
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