You can use a slit charge relay to recharge it along the way, but there only any good if you cover good milage between Jobs.
Or you can just take it out and recharge on the bench with a normal battery charger.
I've read this a number of times from various people about the mileage required for charging. Personally, I've only found this to be an issue when the battery is getting old. Sometimes on larger jobs I might need to run the engine for a while when I'm working or maybe just turn it over for a while if I stop for a break. Today I've had it going for over three hours on one job with no problem and no need to run the engine - and a 70 amp battery at that.
Do you find that a split charge is OK on low mileages Jeff when the battery is relatively new?
Shiner, I don't and never would use a split charge relay because my mileage is far to low and I'm more than happy just chucking my battery in and out every day, my own battery is very old and with a complete recharge after every use, I can expect a few more years service out of it.
If you have a new battery with a SCR it will keep it topped up, but there will come a time when the SCR wont be able to cover the demand and its not until your half way through a Job you will discover the problem.
I don't fancy leaving my engine running while I finish a Job off, not in this day and age anyway, you have hundreds maybe thousands of pounds worth of gear in your van and for some undesirable to just hop in and drive off sends shivers down my spine.
Apart from the insurance implications