I just found out Eco-Charge went out of buisness.If anyone is in the same situation I am I can help change your 2 6v Eco-sys batteries into one 12v.I just got the R44 which needs 9-16v. I have the DA-P1,bv2 and sbm1 which all use 6v. I changed my 2 6v to 1 12v. Let me know if you need instruction doing so.