Charging AG Battery

Thrust sent me an Antigravity 16 Cell battery, I ordered one of the EarthX batteries they have now but I'm not sure if they were out and sent me the AG because I did ask him about the AG too. I'm cool with either one but my question is do I need the Antigravity charger to charge their batteries properly, can I use a battery tender to charge it? I don't want to ruin it.

Thanks
 
Thats what I ended up ordering yesterday, i called Antigravity directly and they said not to use the batt tender. 4 amp was only like $65

Thanks for the response man
 
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