Li(+)(in) + 2 H(+)(out) <=> Li(+)(out) + 2 H(+)(in)
li(+)(in) + 2 h(+)(out) <=> li(+)(out) + 2 h(+)(in)
Li(+)(in) + 2 H(+)(out) <=> Li(+)(out) + 2 H(+)(in)
li(+)(in) + 2 h(+)(out) <=> li(+)(out) + 2 h(+)(in)