Schumacher doesn't seem to be too particular what they stick their name on. If you pay twenty bucks, you're going to get a twenty dollar charger, no matter whose name is on the faceplate. Figure on spending over a hundred bucks for a decent charger, like the Schumacher SE-3010.
That said, even a cheapie charger will last a long time if it's not abused. Given that you've gone through three chargers in quick succession, I have to suspect the problem is as much with the operator as the device. The quickest way to blow a charger is to use the jump start feature. It's best to never use it, but if you do, pay careful attention to the duty cycle information on the front of the charger. The charger needs to cool off for several minutes after each start. The SE-3010, for example, says "5 sec maximum on, 240 sec minimum off". And you can significantly reduce the jump start current if you charge the battery for a half hour or more before attempting a start.
Note that most chargers won't immediately show a charge when you put them on a totally dead battery. They have a current limiting and/or thermal protection circuit that will keep the current low until the voltage in the battery starts to rise.
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Today's Featured Article - The River Tractor - by Charlie English Jr.. This is a 4010 John Deere that was used to farm on the Diamond Island which is in the Ohio River about 15 miles southwest of Evansville, Indiana. About ten years ago, this tractor was parked close to the bank as the river was washing the bank of the island away.
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