Topic: new 9V li-poly (same size as alkaline 9V)

[jerryfreak]

nybody heard of/seen/tried these 9V yet?:

http://www.ipowerus.com/

I wonder what the discharge curve looks like

[JD]

I hear that they are alright for some applications. Problem is they only put out 8.4 volts at full charge.
That is a problem for some electronics.

http://www.ipowerus.com/specs/9v500mah_spec_060411.htm

[wbrisette]

nybody heard of/seen/tried these 9V yet?:

http://www.ipowerus.com/

I wonder what the discharge curve looks like

One problem I have with ALL rechargeable batteries is getting accurate readings from devices they are in. The problem is they produce a steady voltage up until the minute they die, so you'll have what looks like a full battery for a long time, then suddenly you have nothing. To avoid this problem, I change out batteries every 3 to 4 hours when I'm on set. While the batteries are suppose to last much longer than this in the Lectrosonics wireless, I never want to be in the position where my wireless runs out of juice during a take.

Wayne

[boojum]

I run my SONY type Li-Ions out to 80% of rated time capacity at the maximum.  For the same reason as the previous poster: it is so embarrassing to have the session lost when the battery dies. 

[jerryfreak]

not really, there is a discharge curve on both li-ion, ni-mh, and lithium batteries.

some are flatter than others, but NO battery maintains constant voltage, it just doesnt work like that

One problem I have with ALL rechargeable batteries is getting accurate readings from devices they are in. The problem is they produce a steady voltage up until the minute they die, so you'll have what looks like a full battery for a long time, then suddenly you have nothing. To avoid this problem, I change out batteries every 3 to 4 hours when I'm on set. While the batteries are suppose to last much longer than this in the Lectrosonics wireless, I never want to be in the position where my wireless runs out of juice during a take.

Wayne

[manamana]

I can say that these don't put out enough juice to power a sonosax sx-m2, despite it supposedly being able to take as low as 12V total.

[wbrisette]

not really, there is a discharge curve on both li-ion, ni-mh, and lithium batteries.

some are flatter than others, but NO battery maintains constant voltage, it just doesnt work like that

I had a discussion with the Lectrosonic engineers about this issue. They claim the issue is all rechargeables don't present accurate enough readings, so what many do is look at the voltages. The problem (and I can attest to this with the Deva too!) is the voltage will read 14v for quite some time, then drop into the 13v range for a very short time, followed quickly by 12, 11, and then 10v (the voltage cutoff on the Deva). Lectro's recommendation is to use a time-based system, so you know exactly how long a certain battery last in the unit. The only problem I see with this, is as the batteries charge and discharge, they tend not to last quite as long, so you could end up with a dead unit sooner than you thought.

While I'm no expert in this area, my findings seem to mirror what Lectro's engineers told me would happen.

Wayne

[oleg]

I hear that they are alright for some applications. Problem is they only put out 8.4 volts at full charge.
That is a problem for some electronics.

http://www.ipowerus.com/specs/9v500mah_spec_060411.htm

the alkaline drop to 7,5 v under heavy load so the 8,4 which stay in the same situation is way better
the regular alkaline would give you much less if the device you using cant work  with low voltage , so you have to replace the battery way before you get all the jus ,
that's why usually you have 2 batteries in parallel  to keep the voltage go down
the li-ion would give you 99% till your device would not have enough current  to work
the problem with these batteries is usually the protection boards which fucked up or the charged - the chemistry it self way better .

[china_rider]

Not sure... but notice they are only 500mAh.... Thats not that much.  The batteries I use for my R-9 are 2700.  For the R-4 5400.  On each unit that gives me about 6+ hours of recording time.  Unless you run the batteries you post about in tandem which I have never done I would be worried about not getting enough time out of them.

[oleg]

2700 for 1.2 v its  3 watt  capacity
500ma for 8( average) v -4 watt capacity
got it ?

[Jamos]

500mAh is really high for a rechargeable 9v (that is the standard size).

Most of the rechargeables have run at 300mAh max, up until these new ones.

[wbrisette]

Most of the rechargeables have run at 300mAh max, up until these new ones.

Not only that, but most have been in the lower 200 mHh range (230-260)...

Wayne

[manamana]

the problem with these batteries is usually the protection boards which fucked up or the charged - the chemistry it self way better .

the protection boards in the electronics? is that why these batts can't power a sonnosax?

I have four of these and a charger if anyone wants to buy them.

[Kindguy]

the problem with these batteries is usually the protection boards which fucked up or the charged - the chemistry it self way better .

the protection boards in the electronics? is that why these batts can't power a sonnosax?

I have four of these and a charger if anyone wants to buy them.

Shoot me a PM with you want for the set.

Jeff

[Will_S]

the problem with these batteries is usually the protection boards which fucked up or the charged - the chemistry it self way better .

the protection boards in the electronics? is that why these batts can't power a sonnosax?

I have four of these and a charger if anyone wants to buy them.

Are these still available?  And/or has anyone tried these with a PS-2 or willing to loan me one for a bit to test it out?