Try
[link=http://www.amazon.co.uk/gp/r.html?R=1Y9IHGOW47GZP&C=2PLWJIK85A5HM&H=T3VBRDMJCARKLMRVPC81AG1U8QWA&T=C&U=http%3A%2F%2Fwww.amazon.co.uk%2Fdp%2FB00FC42HAA%2Fref%3Dpe_385721_51767431_TE_dp_1]CTEK MXS 5.0T Battery Charger with Automatic Temperature Compensation [/link]
As you can see from the image, it comes with direct battery connectors. I had my OPC connect these to the battery whilst it was there for other work. Not sure how if used outside you can make it all water proof but I am sure others can advise on this.
[link=http://www.amazon.co.uk/gp/r.html?R=1Y9IHGOW47GZP&C=2PLWJIK85A5HM&H=T3VBRDMJCARKLMRVPC81AG1U8QWA&T=C&U=http%3A%2F%2Fwww.amazon.co.uk%2Fdp%2FB00FC42HAA%2Fref%3Dpe_385721_51767431_TE_dp_1]CTEK MXS 5.0T Battery Charger with Automatic Temperature Compensation [/link]
As you can see from the image, it comes with direct battery connectors. I had my OPC connect these to the battery whilst it was there for other work. Not sure how if used outside you can make it all water proof but I am sure others can advise on this.