MF & LM is exactly the same; the only major different is the MF is sealed. Take note that if there is leak, electrolyte level in MF will drop just like LM batteries but theoretically there must be gas expulsion from the battery due to recharging of the battery (water split into hydrogen and oxygen), and MF cost more than LM. Usage life is about the same. My LM can last more than 3 year and still in good shape, but just changed due to preventive maintenance measures.