Batteries

I'm not sure what "chinese current limited" refers to, and anybody that makes statements like "all SLA are all the same" is clearly not to be considered an "expert" either. Sealed lead acid (SLA) or Valve Regulated Lead Acid (VRLA) batteries include Gel and AGM and should not be confused with conventional liquid acid Maintenance Free (MF) batteries.

Manufacturers publish a charge current limit based on the worst case charge voltage - in general this is around 20-30% of the nominal capacity. If you are charging a flat battery from an alternator around 14.2V there will be a high current (50-60A) for a relatively short time (5-10 mins), and this will taper down very quickly - this is quite normal and is insufficient time to develop significant internal heating which will lead to any gassing.

I would not recommend at all using 40A at 14.4V into any battery less than around 130Ah to ensure a long service life. Most common DC chargers are rated between 10-20A which is quite suitable for the common 100Ah size batteries.

Hope this helps, Dave

Krypty
I don't mean to be rude, but how did you expect to get an answer in relation to those circumstances from your original question? Or are you making this up as you go along?

teege