Yes. Agreed; if anyone has any doubts, it is better safe than sorry. Professional advice is like insurance, it might cost a bit but is usually well worth having.
Some other simple checks.
Is the boot light staying on, put a phone in to record video and close the boot. Does the light go out?
Is something left plugged into the OBD2 port? That is always live.
Is the NC’s dark current less than 38mA after the security system settles down to snooze? The auto electrician has the right tools and experience to check this safely.
We should all remember that an old battery might only have a few percent of capacity left (and I’m as guilty as the next man at trying to eke a bit more life from them). If a Smart charger takes it to full almost immediately, then there’s nothing left to fill, like a big bucket full of sand with no space left for the water; time for a new battery.
A good battery for NC (no ‘sand’ ie no sulphation), but flattened, will take overnight on a 3.5A Smart charger before it is full.
When I replaced the nine-year-old Panasonic in my NC, it was down to just enough capacity to start the car ONCE, and then only if it had been warmed by the Smart charger for a few minutes, or was still warm after a run. The final straw was when the all-lights-flashing Christmas Tree effect happened on the dashboard, not enough capacity even to wake up the ignition system!
A new Yuasa YBX5053 was ordered from MBS overnight next day, and all was well again. Here’s an earlier reply from me with some pics showing what I did.