Although with new alkaline batteries (branded, not generic), it does indeed heat up the silicone, the batteries drain dramatically quickly (around 15 minutes), leaving only 3-4 minutes of proper functioning after taking about 3-4 minutes to heat up.
When they run out, the silicone barely heats up enough to come out of the nozzle, but it is not hot enough to properly stick something.
If it had lithium, it would be much better. I will try it with rechargeable batteries, although I think due to the lower voltage, it will be worse.
For very amateur use, I would say it's okay for children, since the silicone doesn't solidify like with regular power, but you have very little time to stick the two surfaces together before the silicone cools completely. If you want to stick a small surface like paper, fabric, plastic, wood, it can be done, but forget about metal, for example, (cold) aluminum