Hi Lance, appologies for the late reply.
Originally, I wanted to send back both devices, but I could not help myself and disassembled them to check what the issue was.
The first one contained dust and dirt and therefore the pin was blocked. As the unlocking spring is situated at the top of the device and the opening is not covered by for example a silicon plug or cap, rain and dust can easily enter and block the spring at the end. You cannot clean this from the outside and really need to disassemble the whole product, meaning you also need to remove the silicon sealing that is present around the spring housing.
It would have been better to foresse a sealing cap or maybe the spring should have been at the bottom of the device?
The second device had another problem. This was the first one a I bought and is a bit older than the other one. So this device was already unlocked more to charge the battery.
I have always used the original unlocking key.
Still, the plastic spring was damaged, although I never used brute force, just standard unlocking.
The material seems to be too weak?
Because of the frequent unlocking and pushing with the unlock key on the plastic spring, a burr appeared and as the spring has a tight fit in that rectangular hole, the burr blocked the spring to spring up again, therefore the pin got blocked. I have pictures but cannot attach them to the post it seems. I'm happy to share them with you.
I have now removed the burr and the unlocking works again.
But this should not be how consumers should solve issues.
By removing the burr, there's now even less plastic on the spring head to push on. Perhaps this should have been a metal part or a harder type of plastic? The plastic felt soft while cutting away the burr.
Anyway, I'm not happy with the design, this is not robust.
