Monday, August 6, 2012

How To Change The Batteries in an Accutire MS-4021b Tire Gauge

accutire ms-4021b
If you enjoyed my review of the Accutire MS-4021b tire pressure gauge, you may also be interested in how to change the battery. Changing the batteries inside an Accutire MS-4021b tire pressure gauge is easy. You'll need:
A Phillips screwdriver (I used a PH1 sized bit and it worked fine).
3 new LR44 batteries to replace the old ones inside your gauge. These batteries are also called A76,  357, or AG13 and are 1.5 volts each, making for 4.5 volts of total power.

Flip the gauge over and unscrew the battery compartment cover. It will drop out when you turn the unit upside down. Then hit the handle against the palm of your hand until the batteries pop out. It took quite a bit of force to knock them loose. I was surprised at how securely they are held in place.

Here you can see the original batteries that came with my device, no-name "button cell" batteries marked LR44. Also note that the battery compartment is completely enclosed in plastic. As cheap as this device is, it seems like there actually was some engineering that went into it. There is no possible way those batteries are getting knocked loosed even if you drop it, and it keeps dirt out of the inside of the gauge. There are even little symbols molded into the compartment showing you which way to turn the new batteries so the polarity is correct, another nice touch I was not expecting.

Just line up your three new LR44 batteries like the inside of the compartment shows and squeeze them into the metal battery holders. Then screw the battery compartment cover back on. Piece of cake!

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