I just got a new charger, a Revoletrics GT1000, with a 4 port parallel board.
Im impressed with the workmanship, especially on the parallel board.
lots of features. It all works super well.
it has a 40A output!!!
you could charge 4, 6S packs at 5 amps each with the parallel board

Here is the kicker:
it was $50 for the charger.
The parallel board was a bit pricey, at $50, but it has so many built in protections, and is well made. It was worth it.

So, order from the Singapore store, and use code GTSAVE
Sale price will display in the cart during checkout after entering PRCODE GTSAVE in the coupon field.