What battery are you using? Has it always rattled?
I've used larger and smaller 18650s which compresses and then decompresses the spring, this has never happened.
I'd say you have had a short. But others will chime in soon.
Get a blank piece of paper, and draw a box.
Dimensions are 5.3cm x 8.6cm (roughly), it's 2.1cm wide if you wanna go 3d.
You'll then realise it's a very compact little unit.
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