It's slightly odd that they quote the charge rate at all. My understanding is that instead of being charged at a constant current (unlike the NiMH and NiCads we all use) lead acid batteries are actually charged at a constant voltage and the current drops as the battery gets nearer to being charged.
In answer to the question of whether you can use it as a power supply for a 12v NiMh charger, no - not directly. You could have it on the battery while your NiMh is also on the battery but it probably would not be good without the battery. I have found that it works for me to have my lead acid charger charging at the same time as I am using the battery to charge my NiMh batteries, but my NiMh battery charger (an orion) shows a lot of fluctuations on the current, it's much steadier just off the battery. I think the two devices are constantly monitoring and adjusting so they both end up going up and down.
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