iPower 9 volts -low voltage

8.3 - 8.5 is the normal starting voltage for these batteries. They
will stay at operating voltage a lot longer than an alkaline, but
start lower and die higher. Like regular lithium batteries, when they
start to die, they die FAST. I use these in my 400 series
transmitters and do not allow them to get below 7.6v. They die
without warning at all.
 >> Stay informed about: iPower 9 volts -low voltage 

On Jul 23, 12:54 pm, terryn... RemoveThis @mindspring.com wrote:
> Re: iPower 9 volts
>
> Do any of you own the both sizes of the iPower lithium 9 volt
> batteries? I have about 20 of each size and have experienced problems
> with some of the smaller size batteries. I had to throw away several
> batteries that failed. Several other small batteries only measure
> 7.5 volts. Typically I measure the voltage several hours or days
> after removing the batts from the charger. These are not hot off the
> charger readings. The larger batteries measure 8.3V to 8.5V, and some
> of the smaller versions also measure 8.3V to 8.5V.
>
> I do wonder why I had several smaller batteries to fail, and some that
> measure only 7.5V. The batteries are used for similar duties, and
> share the same chargers. The older ones seem stronger even though
> they are a year older than their smaller cousins. The larger
> batteries have gone through many more cycles and so should be weaker
> than the newer version.
>
> Any thoughts?
>
> David Terry

David,

I have noticed also that these newer batteries have a some what
shorter life cycle then the older. I've completely replaced most of my
older ones, and don't really use the ones I have, since the fit was
problematic. However, aside from the shorter life, these newer sized
batts also show faulty on the charger sooner. That never happened with
the old ones. They would charge up with no indication at all. I also
have had some favorable instances with these. I've reached +9 volts
charged on 2 batteries one night. Never happened again, though. From
what I can tell they lasted longer in the packs also.

I think there is either a quality control issue, or they changed the
formulation when they fixed the damaged battery issue from the earlier
versions(400mAh).

I've got a few batts that appear to be failing slowly. They charge up
-.01v after each charge or so. I've found that once the won't go over
8.12v, they won't last through lunch, and I don't use them anymore for
Lectro's, they get marked with a "C" and are delagated to Comteks.

Mike
 >> Stay informed about: iPower 9 volts -low voltage 

On Jul 23, 2:27 pm, audio....RemoveThis@gmail.com wrote:
> Question and comment:
>
> What do you mean by both sizes of 9v. I have a set of 8 and they do
> not work in some of my wireless units because the batteries have a
> shoulder and the contacts do not reach above the shoulder enough to
> mate with some of my Lectros (100 series). Is this a problem that was
> corrected recently??

The newer version of the batteries are closer to standard size 9V
batts (such as an Eveready (V alkaline). They fit into all the Comtek
and Lectro stuff that I own. The original iPowers were slightly
larger. They were a tight fit with Lectro R1s and 200 series belt
packs, but were simply too big for Comteks. I'm not sure about the
100 series, but it seems that earlier model Lectros were less tolerant
of oversize batteries.

My question is about quality control in the newer batteries. My old
ones performed consistently, but I've had several failures and low
voltage issues with the newer batteries.

David Terry
 >> Stay informed about: iPower 9 volts -low voltage 

On Jul 23, 2:37 pm, Robert Sharman <sharmanf... RemoveThis @earthlink.net> wrote:
> 8.3 - 8.5 is the normal starting voltage for these batteries. They
> will stay at operating voltage a lot longer than an alkaline, but
> start lower and die higher. Like regular lithium batteries, when they
> start to die, they die FAST. I use these in my 400 series
> transmitters and do not allow them to get below 7.6v. They die
> without warning at all.

Robert,

I observe similar discharge curves with my batteries. Still they last
longer than alkaline, cost less over the longterm, and are
environmentally friendly... so I am a big fan. The reason for my post
was to see if others had issues with batteries that died, and would
not charge and the other issue of low voltages around 7.9 instead of
8.4. My older batteries were consistently good, yet with my newer
ones I had problems with seven or eight batteries out of twenty. I
want to purchase a few more, but I would prefer that all of them work
properly.

David T
 >> Stay informed about: iPower 9 volts -low voltage 

"Michael Clark" <audiofilesound.DeleteThis@mac.com> wrote in message
news:1185316773.134218.222660@k79g2000hse.googlegroups.com...
> On Jul 23, 12:54 pm, terryn....DeleteThis@mindspring.com wrote:
>> Re: iPower 9 volts
>>
>> Do any of you own the both sizes of the iPower lithium 9 volt
>> batteries? I have about 20 of each size and have experienced problems
>> with some of the smaller size batteries. I had to throw away several
>> batteries that failed. Several other small batteries only measure
>> 7.5 volts. Typically I measure the voltage several hours or days
>> after removing the batts from the charger. These are not hot off the
>> charger readings. The larger batteries measure 8.3V to 8.5V, and some
>> of the smaller versions also measure 8.3V to 8.5V.
>>
>> I do wonder why I had several smaller batteries to fail, and some that
>> measure only 7.5V. The batteries are used for similar duties, and
>> share the same chargers. The older ones seem stronger even though
>> they are a year older than their smaller cousins. The larger
>> batteries have gone through many more cycles and so should be weaker
>> than the newer version.
>>
>> Any thoughts?
>>
>> David Terry
>
> David,
>
> I have noticed also that these newer batteries have a some what
> shorter life cycle then the older. I've completely replaced most of my
> older ones, and don't really use the ones I have, since the fit was
> problematic. However, aside from the shorter life, these newer sized
> batts also show faulty on the charger sooner. That never happened with
> the old ones. They would charge up with no indication at all. I also
> have had some favorable instances with these. I've reached +9 volts
> charged on 2 batteries one night. Never happened again, though. From
> what I can tell they lasted longer in the packs also.
>
> I think there is either a quality control issue, or they changed the
> formulation when they fixed the damaged battery issue from the earlier
> versions(400mAh).
>
> I've got a few batts that appear to be failing slowly. They charge up
> -.01v after each charge or so. I've found that once the won't go over
> 8.12v, they won't last through lunch, and I don't use them anymore for
> Lectro's, they get marked with a "C" and are delagated to Comteks.
>
> Mike
>


I've been extremely happy with my iPowers (I have 12 of them) and have yet
to cycle them enough I guess to experience a failure. I never use a volt
meter and my Lectro 205 series wireless and R1 IFB's do not have voltage
read outs so I can't really tell you what they are doing. Anyone know of a
reasonably priced "dis-charger" that would show the actual current capacity
of these Lithium Polymers? Possibly a nickel metal charger that could be set
for discharge only?
 >> Stay informed about: iPower 9 volts -low voltage 

I have 12 - small size I power 9 volts that I use in my lectro
400s. After approximately 15 charges I have one that does not hold a
charge and three that are only charging up to 7.8 and 7.9 volts. The
rest are charging up to 8.3 / 8.4 volts. Occasionally I've
accidentally run them all the way down but as a rule change them after
they reach 7 to 7.5 volts. 4 out of 12 batteries seem like a high
number of failure or low charge problems. I also am wondering about
the quality control of these batteries.

Andy
 >> Stay informed about: iPower 9 volts -low voltage 

there is no need to discharge the batteries , the best is to replace or
charge batteries at 25-30 capacity
there would be no segnificant change in voltage under load , the only way
to see the capacity is the actual voltage on maximum charge which is about
4.2-4.3 v per cell
fully discharge batery will show you 7.2 v

"Andy Turrett" <aturrett.DeleteThis@aol.com> wrote in message
news:1185364861.469931.261250@l70g2000hse.googlegroups.com...
>I have 12 - small size I power 9 volts that I use in my lectro
> 400s. After approximately 15 charges I have one that does not hold a
> charge and three that are only charging up to 7.8 and 7.9 volts. The
> rest are charging up to 8.3 / 8.4 volts. Occasionally I've
> accidentally run them all the way down but as a rule change them after
> they reach 7 to 7.5 volts. 4 out of 12 batteries seem like a high
> number of failure or low charge problems. I also am wondering about
> the quality control of these batteries.
>
> Andy
>
 >> Stay informed about: iPower 9 volts -low voltage 

This message is not archived
 >> Stay informed about: iPower 9 volts -low voltage 

usually the problem is not with the cells as but with the protection circuit
board

"Andy Turrett" <aturrett.DeleteThis@aol.com> wrote in message
news:1185364861.469931.261250@l70g2000hse.googlegroups.com...
>I have 12 - small size I power 9 volts that I use in my lectro
> 400s. After approximately 15 charges I have one that does not hold a
> charge and three that are only charging up to 7.8 and 7.9 volts. The
> rest are charging up to 8.3 / 8.4 volts. Occasionally I've
> accidentally run them all the way down but as a rule change them after
> they reach 7 to 7.5 volts. 4 out of 12 batteries seem like a high
> number of failure or low charge problems. I also am wondering about
> the quality control of these batteries.
>
> Andy
>
 >> Stay informed about: iPower 9 volts -low voltage