Owners of other Nissan vehicle such as the Sentra, Altima, Maxima, Murano, Rogue,  Note, Leaf, Juke, Kicks, Latio, Almera, Sunny, Qashqai, NV200, Pathfinder, Frontier and X-Trail may also find these DIY instructions to be helpful.

The compatible replacement coin cell battery (also known as a "button" or "watch" battery) is part number CR1620 which is available from various manufacturers such as Duracell, Energizer, Panasonic, Toshiba, Sony and Maxell.

The tools needed to access and replace the key fob battery include a small Phillips head screwdriver and a small flat head screwdriver such as from a Jeweler's Screwdriver Set.

The first step is to separate the key ring and your other keys from the fob.

Then turn over the fob and locate the small Phillips head screw situated below the "Nissan" logo near the metal ignition key.

Use a small #0, #00 or #000 sized Phillips head screwdriver to carefully loosen the screw in the counterclockwise direction (lefty loosey).

Since the screw is made of relatively soft metal and it has probably been in place for several years, there is a very good chance that the Phillips head will strip when you attempt to loosen it.

Nissan also usually applies a small amount of threadlocking adhesive fluid (such as Loctite Blue medium strength) to the threads which makes it even harder to remove the screw.

Please proceed with caution and at your own risk!

If the screw head strips, you'll need to use an electric drill with a small drill bit to remove the head.

Start with the smallest drill bit in your set.

Very carefully and very slowly drill out the head of the small Phillips head screw until it is worn away.

Do NOT apply excessive force. Do NOT drill at high speed!

It took me at least 10 to 15 minutes of very slow drilling to carefully wear away the head of the screw.

Insert the small flat head screwdriver into the notch.

Very gently twist the screwdriver to pop apart the front and rear cover of the fob assembly.

Try to avoid using excessive force.

If you removed the screw or drilled away enough of the screw head, the rear cover should pop off relatively easily.

If the rear cover will not pop off, carefully and slowly remove more of the screw head with the small drill bit.

Set the rear cover aside in a safe place.

If you'd like to replace the old screw with a new one, use a pair of needle nose pliers to twist out the threaded end of the screw by grasping it on the drilled out head. Rotate the old screw in the counterclockwise direction.

Try to avoid bending, scratching or damaging the metal electrical contacts.

The OEM (original equipment manufacturer) battery in the fob for this 2019 Versa SV was a Murata CR1620 3V lithium coin cell made in Japan.

Lower the new CR1620 battery down into the holder.

Make sure the new battery "pops" securely into place.

Line up the rear cover with the key fob housing.

Make sure that the two halves of the fob are flush together at every edge.

If you were able to remove the original screw, replace it by turning it in the clockwise direction with the Phillips head screwdriver.

If you had to drill out the old screw and were able to remove it, spin in a compatible replacement Phillips head screw. Tighten it in the clockwise direction until it is snug.

To test the new battery, stand near your Versa and press the "Unlock" and "Lock" buttons.

If the new battery is working properly, you should hear the door locks opening and closing or see the parking lights flash.

Be sure to write down the battery change in your vehicle's service records.

Note - You shouldn't have to reprogram the key fob. Just changing the battery does not clear the original programming from the factory.

Please check out all of my 2012-2019 Nissan Versa DIY Repair & Maintenance Guides.