It sounds like you and Mr.70 have had some success with the batteries, however others have not. I did check the charging instructions from the manufacturer and for optimum life the voltage should be maintained around 12.8 volts. Should the battery require charging, charge the battery using a charger with a 10amp-12amp range for 2 hours. They are very specific that the charger's output voltage must not exceed 15V.
Perhaps not maintaining the battery accounts for the premature battery life
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