You will need to fork out a bit of $$ as to charge the 100ah you need something with 8+ amps otherwise the batteries can have some issues.

Yeah they are pricey alright ....looking around 400 bucks for the ctek.
Im looking at a Victron blue IP65 smart charger , 12v 15a for $250. It has good reviews and does the lifepo4 too, just want to ph the suppliers 0800 tomorrow before buying to confirm that it will do smaller batteries (6ah) too.
Thanks for the tips .....I do like the ctek just not the price but as above I have already binned one bad buy.

Yeah thats all good , but what battery charger did he end up buying ?😆😆.
I guess its hard to know for sure but I think the ctek is over priced ....right from the time I 1st saw one years ago ....which is why I never bought one. I have no doubt they are a good thing and sometimes that makes it the thing to go for ....peace of mind an all that 🙂
The Aliexpress one was about 40 bucks so I pretty much got what I deserved there.
My present charger is probly 30 years old and has always done the job but batteries are getting expensive and thusly worth looking after a bit better than just hooking them up to the ole "force feed " charger.
Im gunna ring the Victron guy coz tbh Im getting confused after lookin at so many different options .