This charger is junk. I tried connecting them to 3 different batteries and used both connectors and it wouldn't charge at all. I also connected this to my MultiMeter and there was no electrical flow at all. Customer service is a joke, taking 2 day to respond to each Amazon message, and their final solution was for me to send them back, paying postage to do so, and they would refund my money plus shipping by PayPal once they recieve them and determine themselves they are not working.
The quality is piss poor. Narrow cables that won't last very long even if it would throw a charge. Cheap plastic for the housing, and the battery connectors are flimsy at best. Instructions are in Engrish so you will need to try and understand them yourself. This is a junk product and the seller isn't any better. Stay away, you have been warned!