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All batteries gas even AGM or Gell batteries noway around them. If they could not gas and expel the hydrogen build up they would explode. They gas just not as much, thus use the correct charger. If charging them with charger in Monty then they will gas same as your flooded battery does. I cannot get it to add to this post but I have picture of both gel and AGM that gas i can send it to you by regular email if you wish.
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