I got one of the 1000w 48v kits from ebay. The kit came with a 48v SLA charger that I wasn't sure of the quality, so I opened it up and took some pics of the internals and It doesn't look too bad. It has a cooling fan and looks pretty decent. I think it is rated at 2 amps. I am gonna use it to charge my (4) 12v 20AH SLA batteries. Here are some pics. Is anyone else using this charger?