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Replaced the battery in the remote.
In the front under the hood, just to the right of center.
A 2008 mazda 3 has a size class "35" battery (confirm this when you purchase with your vehicle specifics). As for CCA, that battery will generally be in the 400-600 area for CCAs.
The battery is a Mt-MX5. This is a Interstate battery part#. fits 1990-2008 Mazda Miata. Go to interstatebattiers.com to find a dealer near you.
Open it up and look see. You now know what replacement battery to buy.
Okay first you split it there should be a line all the way around. You spilt it open and than you see the battery take the battery out and put the new one in. The following applies to a 2008 MX5 Advanced keyless entry remote. Pull out the embedded key from the lower right corner of the remote. Use a tiny precision screwdriver to pry out the flap located at the lower left corner. This exposes the battery. Stick a paperclip in behind the battery and pry out. It takes a 3 volt CR2025 battery. (panasonic number) Pay attention to + mark on the cover flap.
The key fob battery on a 2008 Nissan Altima is replaced by using a coin to open the rear of the case. The battery can then be popped out and a new one installed.
The 2008 Mazda MAZDA6 has 16 valves.
The 2008 Mazda MAZDA5 has 16 valves.
The 2008 Mazda MAZDA3 has 16 valves.
The key fob battery in a 2008 Chevy Cobalt is changed by opening the case with a flat blade screwdriver or coin. The battery can then be pulled and a new one put in place.
The 2008 Mazda MAZDA5 has a 5-speed manual.