I have a pair of spy glasses I use for hands free recording and I think I messed with the internal lithium-polymer battery and limited its charge life by not charging it the ideal way. Mine only lasts 20 minutes but the device was advertised as 60-120 minutes of continuous recording time. The ?Chinglish? instructions were not very helpful.
I bought the device a couple of years ago from an online vendor but this item on Amazon is identical:http://www.amazon.com/Glasses-Camera-Eyewear-Hidden-Reader/dp/B00LCL24M8/
There are better ones on the market now but I would rather get these working first if possible.
Everything is soldered in place and I am not equipped to try to address this myself. I can run a USB cable to an external battery but that sort of defeats the purpose of minimalism. So I would prefer a better internal battery. I already had a jeweler replace the internal 4 GB card with a 32 GB one so memory is not an issue.
As an aside, the maximum device power consumption is listed as 0.8 watts. I opened the case and the actual battery says 3.7V 270mAh. My arithmetic calculates a minimum expected recording time of 1.25 hours.
I subsequently read more about these kinds of batteries and apparently they must be treated with great care to get maximum performance!
If anyone here thinks he or she can help, please post so we can make arrangements.