I've done plenty of coding and use a
Battery Minder set on 8 amps. This has worked fine for everything I've done, voltage never drops below 13 volts. Plus it's a maintainer, desulphator and has rejuvenated many a battery that were near end of life. If I just need to code one module, say the LZM, I don't even bother putting the charger on, it only takes a few seconds and if you have a good battery, you should be okay.