Service Life: 1000cycles(>=60% C5mAh,0.2C discharge)
Weight: 28g
Charging Voltage: 8.4+/-0.15V
Ambient Temperature Range: Charging: 0-45 centigrade, Discharging: –20 to +60 centigrade, Storage: –20 to +40 centigrade
This is a two cell LiIon rechargeable battery.
It has over voltage protection at 8.63 and 8.64 volt.
It has over discharge protection at 5.08V and 5.57V.
The two batteries are just about the same capacity.
The voltage is lower than NiMH and more like a nearly empty alkaline, but it will stay this way for a very long time.
Conclusion
These batteries have more than double capacity compared to NiMH 9V batteries and are close to a alkaline battery at low load, except this battery will maintain high capacity and voltage at high load.
In moderate to high load situations this looks like a good replacement for alkaline.
Taken from above.
This is a two cell LiIon rechargeable battery.
It has over voltage protection at 8.63 and 8.64 volt.
It has over discharge protection at 5.08V and 5.57V.
Thanks for the review HKJ.
I would expect it, but a fast test do not show any.
I need to charge the battery fully to do a correct test, but it looks like it may be at a rather high value for the cell size.
Is it normal for those over-voltage protection figures to be so high? Heck, I was going to suggest these could be assembled with 4.3V cells or about, since there's also around a 10% less capacity than wrapper claimed. These product overstatements seem too common between rewrappers, and the higher the figures, the bigger the lie. :|
The over voltage protection is not that high, it would say it is a good value.
But the over current protection is way to high, I could draw above 2A from the cell (I will get more precise value when the cell is fully charged).
With a fully charged battery I could draw 4A without any protection kicking in. I did not try higher current, because I need the batteries for some other tests.
Maybe there's no over-current protection? With the internal resistance I observe in the graphs for this 2S setup, wouldn't the over-discharge protection trip between 2 to 4A if the state of charge is low enough? It seems to me so. :STEVE:
If you draw the current for some time the over discharge will trip, but not for a short 4A burst (Few seconds).
Normal single cell protection chips have over current protection, this is done by measuring the voltage across the transistor. Using a very good transistor will increase the current trip point. But I do not know the type of chip used in this battery and if it supports that type of over current protection.
Alkaline batteries are 1.5V when full and below 1V when empty, this means a 9V battery is first supposed to be empty below 6V.
A 9V LiIon battery is 8.4V when fully charged and will be empty when at 6V, this matches fairly well with the 6 Alkaline.
Most equipment will work fine with a LiIon 9V battery, but there are probably a few exceptions.
I would not replace AA batteries with a 9V battery, I doubt it can deliver power enough (A LiIon 9V probably can for some time).
My favorite AA replacement is eneloop either original or rebranded, as long as they are charged correctly and not run totally empty they may well last 10 years (That is the 1900-2000mAh type)
When you say “(A LiIon 9V probably can for some time)” Which LiIon 9V battery are you referring to ?
A:) I saw those eneloop rechargeable batteries but they have 1.2 V instead of recommended 1.5 V, so I use 6 1.2V , it would be 7.2V
It is the same story, NiMH (Eneloop) starts at about 1.4V when full and are empty at about 1.0V, this matches Alkaline fairly well (Except a few devices)
I do also have a lot of AA/AAA curves: Battery test-review 18650 comparator
Top part is rechargeable batteries (NiMH), bottom part is primary batteries (Alkaline)
[quote=DroneFisherMan]
9V blocks is two LiPo cells.
A good place to check for larger LiPo batteries is Hobby King:
Look for two cell type.
To charge these cells you need a “Hobby Charger”, they can also be found at there, but notice that many of them is 12V powered, not mains powered.