Involvement:General (knows how to use it) - Ownership:1 week to 1 month
+ Build quality is o.k.
+ Fits applications, where protected CR123As are too big
+ Cheapest rechargeable Li-Ion battery available
- One cell of four I got is different from the others: The two venting holes on the positive pole are missing.
- The same cell looses its voltage quite fast and has significantly less capacity than the other ones. I realized this not until it got overly discharged to ~2.3V. After recharging, the cell still works, but it might have been damaged in one way or the other.
- Not protected. Refrain from overly charging/discharging.
The problem when using two or more of these in series is that one battery might be weaker than the other (as in my case), and this battery will be overly discharged.
Only buy these, if you know how to handle non-protected rechargeables, or if the protected cells will not fit your application.
All in all, I am satisfied with my purchase.
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