Those cheap lawn mower batteries you are lucky to get 2 years out of them.
The most I got was 8 years out of an Interstate, but it was in a garden tractor I used year round, and kept on a battery tender during the cold months between snow storms. For machines not used in winter, your best bet is removing the battery and keeping it in your basement on a tender, otherwise it will probably be dead. Frequent use of the machine they are in and charging helps keep them functioning for longer it seems.
The most I got was 8 years out of an Interstate, but it was in a garden tractor I used year round, and kept on a battery tender during the cold months between snow storms. For machines not used in winter, your best bet is removing the battery and keeping it in your basement on a tender, otherwise it will probably be dead. Frequent use of the machine they are in and charging helps keep them functioning for longer it seems.