Yes it will charge the battery. Just do not expect it to do it super fast. The 75 amp charger can put out 75 amps to a set of batteries, say a 600 amp hour battery bank, for around 2 hours. But after the 600 AH battery bank is over 50% full, then it will only charge at say 50 or 40 amps.
Your typical 85 AH car battery might accept 50 amps for a few minutes, then drop down to accepting 25 amps or less once the battery voltage rises to 13.8 or 14.2 volts (depending on the charger output voltage.)
If you have a older style converter, then I can boil away a lot of water, and heat up a small battery.
I have a very smart Trace 20 amp Truecharger and I made it portable, by installing #8 jumper cables to the charger output. It works fine for charging anything from my car battery to my 20 AH wheelchair battery, to the 400 amp hour battery bank in my RV.
Good luck,
Fred.
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