I have a Orion-Tr Smart 12/24-10 DC/DC charger. I am using it in my motor home to charge my wife's 24V wheelchair (it has 2 12v sealed lead/acid batteries in series). The problem is the charger moves through the charging stages too fast and as a result the wheel chair is never fully charged. It stays in the bulk stage for less than 5 mins and the absorption stage for 30-60mins even when the wheelchair batteries are well discharged. (I would expect the bulk stage to be several hours based on how it works with the wheelchair mains charger). I have played extensively with all the charging settings including all the default settings and tried the custom settings supplied by the wheelchair supplier and the problem persists. Any suggestions? Is this likely to be a settings issue and if so can anyone point me at the correct settings or do you think I have a hardware problem or something else?