Do you own a cell phone? A tablet? A laptop? A camera?
Thanks for the review HKJ !
Can these batteries be drain low before its need a recharge?
They contain protection that will disconnect the output when they are empty, they will not drain the internal LiIon cell dangerous low.
Thanks for the reply!
can we do teardown on this battery ?
I may do that later together with a few other of same type.
Is this LED only used during charging?
Can it be used to indicate remaining capacity at all?
Given the flat voltage curve, I’m guessing it’s not easy to tell how much juice is left in it.
The led is only for charging, there is no way to see how much energy is left in the cell.
The one thing about these Tenavolts cells is that they don’t have a usb port, so you’d better not lose the supplied charger, but if you have 12 of them, then I guess you already have 3 of their chargers as well. 
Easy to get another ‘charger’. Do you lose your chargers? 
An advantage, If you want to call it that, is it only takes one USB connection to charge 1 > 4 cells. Personally I think I prefer that over the USB direct connection.
The charger is a box barely larger than a storage pack for AA. If you buy it with the charger, that’s what it gets shipped in. I guess you could store them in it. Don’t know if there is a low grade drain, but I think not.
A single usb cable that comes with the Blackube cells can charge 4 cells as well.
A splitter cable, good idea.
Seems then that it comes down to preference, IF you care to bother with these. The USB port adds one more bit of electronics to the cell, which is a pretty cramped space.
By my measurements using a ZB206B+ (an FET discharger, not resistance) I get about 140mAh more than HJK for the Blacktubes. 0.5A and 100mAh for 1.5A. I think the difference may be that port. I didn’t push beyond that since it’s evident the buck converter seems to overheat and fail. I had hoped to use them for underwater strobes and it became evident it was not a serviceable idea.
If they are a tech that works for you, either would seem to suit. Not sure how they’ll show themselves for the long haul. Thus, the purchase and experiment. I’ve got a bunch of Eneloops going on 12+ years old that need replacing so thought I’d try these out for ….some……uses.
Yup, I ordered some Tenavolts just for S&Gs since they were on sale. Still don’t know what I’m going to use them in.
They’ll work in almost any application under 1.5A. I find the best uses is a travel Sonicare that takes AA. It was lame on NiMh, almost as good as the lithium power ones on Tenavolt. Similarly a nose trimmer and a beard trimmer both work with more punch. Also a bunch of LED night lights I have around the house. They don’t dim, and the battery is a tad smaller diameter so pops in and out of the slot much better.
Haven’t bothered to try them in very low drain applications. Don’t see that as their best use.
Curious what their self discharge is like compared to LSD NiMH cells.
FYI, I did a quick write-up on these, in case anyone is interested:
Trying to get them here in the UK is a pain.
Anyone got any links to them?
Hi, do you know how these battery would react over time if charged very often ?
Here is my use case :
A device is adapted to fit in a charging station with magnetic connectors using this battery.
During the day, the device would be regularly used during 15 minutes and returns to a charging station between each use (could be 5min to 2h).
During the night, the device would stay in the charging station.
I can eventually program the plug of the charging station so that it is not always on.
I wonder if the battery would support such a use-case, what do you think ?
Thanks for your help,
SB