12 volts. Is this really what you are after? 12 volts DC negative ground
has been the standard for all autos for at least 50 years.
A quick google "1998 hyundai elantra battery size" returns more info than
you'll ever need.
The biggest one that will fit in the space.
I managed to shoehorn in one that was for
a Ford truck. 875 amps. Wal-Mart.
It cranks really well now.
Make sure its not too high though.
Don't want the hood contacting the battery.
I used foam and putty to figure the available
under hood space using the old battery.
Every car made since the 1960's or so has a 12 volt battery. Look at
it and it may have the size right on top, like 24F, etc. Every
battery store has a chart to look up what you need, as do many web
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