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I coded many cars while on battery power and never had any issues. Most of these batteries will last more than an hour on battery life as long you don't turn on the headlights. If you're in a garage with no sunlight, just make sure you turn the headlight knob to the 0 position so that the headlights are off and don't drain the battery. If the car is low on battery, you'll get a warning on the instrument cluster anyways and that's when you should stop or turn on the engine.
What I recommend though, if you're going to code multiple ECUs on battery power, turn off the car and turn it back on after you're finished coding before going to the next one. That will prevent the car from going to sleep if you're making a lot of changes to multiple ECUs.
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