LED Light String Battery Box

My daughter loves these LED string lights. The problem is, she burns through the expensive lithium batteries pretty fast. So I made these boxes that hold (4) AA batteries. They last longer and are less expensive. The (4) AA batteries work for this specific type of LED string light that required (6) volts.

Here is a link to the battery holder I use in the photo.

https://www.amazon.com/LAMPVPATH-Battery-Holder-Bundle-Single/dp/B07BNMKNQX/ref=sr_1_9?keywords=AA+battery+box&qid=1578782922&sr=8-9

Please let me know if the lid fits too tightly, I'll tweak it.