I only have a dynamite Prophet Plus so could only use a 4amp charge. It did put some amount of charge in the battery in question, but not more than a couple minutes of 50% power and it was dead again.

Thanks Duster_360 for the tip.

However, I am looking to upgrade to lipo anyway. I've read a ton of posts on the "best" charger. Got any opinions? I'm not a racer, but I wouldn't mind having a charger that is ac/dc, handles most of the lipo cells, and has a built in balancer.

Nothing personal, but I will not buy another Venom battery until there is proof that their product delivers reasonable results. I've owned this battery for less than a year, and only ran it maybe a couple times a month. In other words, it's been properly taken care of and charged, yet it's only yielded about 20 runs. I think I paid $35 for it new at my LHS. That's $1.75 per 7 minute run. Not what I would call a good deal.