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Again, check with Sears. See what Warranty they have available on 6v auto batteries. Currently, 6v auto batteries have such a limited sales volume ( compared to pre 1955 when everythig had 6 volts) , it may very well be that nobody currently makes 2, 3 or 4 year batteries. Sears has one of the largest battery manufacturers making Sears batteries, that is why I recommend Sears. If they don't have it, it's likely nobody makes a long lasting 6v battery. Also try Interstate Batteries. They have a web site and they responded well to eMail questions. See what Warranty Interstate has on 6v auto batteries. Now, as far as battery maintenance: Auto batteries are very unhappy when they are not fully charged. The internal plates become coated with sulfate and the plates become less efficient at discharging electrons (electrical current to drive starters,bulbs etc). You can buy fairly cheap automatic battery trickle chargers ( less that 2amp) that will keep the battery fully charged.Be sure to get a AUTOMATIC trickle charger so you can just leave it connected. Point #2 : Battery acid laying on top of the battery very efficiently discharges battery current between the + and - posts even with the battery cables disconnected. Wash the top of the battery 4-5 times with plain water and scrub brush .Place the RED probe of a voltage meter close to the + post and the black probe near the negative post. When it finally stops reading 6v you know you have scrubbed enough.
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