After a bit of googling on the model number it seems as if it's only suitable for 1400-1600mah capacity batteries. This is probably due to the 30min timer and a max charge rate of 2.3A.

[link=http://modelsport.co.uk/?CallFunction=ShowSpecification&ItemID=12125]This[/link] should be suitable - i use one for charging stick & RX packs and never had a problem with it.