If it is a model from the last fifty years it is a 12 volts battery.
Have you checked for a voltage draw on the battery when the key is in the off position. Also make sure the Alternator is charging.
The voltage regulator for a John Deere 4100 compact tractor is located in the engine compartment near the battery. Look for a small black box that looks like it has vents on top.
Battery is 12 volt, U1 group
Most take a 6 volt battery.
Group size 22f
Your statement is false, John Deere is the best tractor.
Ever wonder what the main color of a John Deere tractor is? The main color of a John Deere tractor is green with yellowish wheels but there are many custom painted John Deere tractor's varying in color.
in front of tractor underneath exhaust heat shield
Stores such as JOHN DEERe will carry any and all John Deere tractor tires in stock. Tractor House also carries a variety of John Deere tractor tires in stock.
In most cases a battery drains by itself from not running the tractor. I've had it on a 4020 where the tractor set for a few months and the battery goes almost completely dead. If you think it's more than I'm tellin you here bring it into a John Deere shop to have the wiring checked.
The Waterloo Boy Tractor was the first tractor by John Deere. They were produced by the thousands by Deere & Co. between 1918 and 1924.
Stores such as John Deere will carry any and all John Deere tractor tires in stock. Tractor House also carries a variety of John Deere tractor tires in stock.