As much as you want...

I'm assuming it's a high-end battery, which in that case you can charge 40A if you want, although some people will say it's not as safe, and wears the battery faster. It's really up to you, just be close by while charging.

It’s a Protek lihv . I’m just learning this charger

If its a nice new pack, 10-20a should be perfectly fine. I have batteries I've charged at 20a most of their life with little degredation in their performance. Above 20 and up to 40 gives you a temporary boost in performance but hurts their life.

But I have 4 reedy 6100s that are right at a year old and their IR's are 1.6-1.8 per cell now and they were 1.0-1.1 last year when new. They've mostly been charged at 40a but lately a lot has been 20. So like I said earlier 10-20a is perfectly safe, still quick and not really damaging.

Also important is good charge leads. I've tried a few and not been super impressed but Im going to try some Reedy ones next. A way to tell is if you move the cord in the battery or charger and it changes the charge voltage. Keep that in mind and charging will be plenty safe.

thx for all the info. I appreciate it.

as far as charge leads I’m using trinity leads .

LIHV charge is only different in voltage.

Unless you are bashing, it's pointless and not legal, even then tiny bit more speed for a short time.

For racing just charge using lipo setting to 4.2 and you are good.

The charger can supply its max. Whether or not the battery can handle it is a different question.