When troubleshooting and fixing engine start issues, I often have to try starting the vehicle a lot. Eventually I kill the battery. Then I have to recharge the battery and wait. Not only is this inconvenient, but it's a cruel way to treat an innocent battery.
How can I work on starting issues without [ab]using the battery? Disconnecting the battery and hooking the car to the charger (I've never tried this) doesn't seem like the right thing to do, I haven't checked the charger specs but I doubt it can output the required crank current. I suppose I could leave both the battery and the charger attached to the car at all times but I'm not sure if that's a good idea or not, either -- I'd like to not damage the charger, and also, if possible, not damage the battery or unnecessarily reduce its lifespan.
This is for situations where the vehicle will not start, and so a quick jump start and letting it recharge itself is not possible.