Dexcom – hacked
The battery in my Dexcom G4 transmitter finally died, after a bit over a year.
Naturally, the only logical next step was to hack it open and look around — because that’s what guys like me do.
Finally, it started to give way.
This isn’t just a plastic housing around a hollow core; this thing is solid. It must be injection-molded to fill every nook and cranny inside of the thing.
Two Maxell watch batteries. (Did you know Maxell was still around? I thought they went away with the cassette tape)
When new, they measure 1.55 Volts.
Used, one of the batteries measured less than a third of that (the rated 1.55 volts).
The other was far worse. But this tells me that the batteries are placed in parallel, so the second battery extends the transmitter’s lifespan, but doesn’t offer more power. Not a typical configuration, but considering they are neither rechargeable nor replaceable, it makes sense.
(This entire post was written on an iPhone, because I was too lazy to copy the photos to a computer. I hope the formatting is OK — apologies if it is not)