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Home > Archive > Hearing loss support > May 2005 > Rechargeable hearing aid batteries
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Rechargeable hearing aid batteries
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| Tommy 2005-05-21, 11:48 am |
| Hi !
I get Oticon Syncro CIC model of HA and it is great, but my batteries,
iCellTech Ultra power, have life of 4-5 days. I would like to buy
rechargeable batteries bud I didnīt find anything on web. Can somebode help
me. I just find this http://store.sundancesolar.com/soaidsoheaid.html but
only for size 13, not for size 10 wich I need.
Thanks
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| richard48@webtv.net 2005-05-21, 5:51 pm |
| Where do you get rechargeable hearing aid batteries?
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"Tommy" <tperegli_REMOVE_@inet.hr> wrote in message
news:d6nisp$73n$1@sunce.iskon.hr...
> Hi !
>
> I get Oticon Syncro CIC model of HA and it is great, but my batteries,
> iCellTech Ultra power, have life of 4-5 days. I would like to buy
> rechargeable batteries bud I didnīt find anything on web. Can somebode
help
> me. I just find this http://store.sundancesolar.com/soaidsoheaid.html but
> only for size 13, not for size 10 wich I need.
>
> Thanks
I researched this item several years ago. My recollection is that the
rechargeable batteries are so limited in electrical storage capacity that
they would power an ordinary HA only for a few hours compared to about 10
days for the usual zinc-air batteries. That would quickly become a real
PITA. As I recall, the batteries were nicad or some equivalent which do not
have the high energy-density (technical specification) of the zinc-air
cells.
Hearing aids generally draw about 1 milliamp of current and this seems to be
a function of the chip rather than the size of the aid. Your #10, being
half the size of a #13 would be expected to last about 5 days, rather than
the 10 days, more or less, of the larger #13. My new BTEs, use the rather
large #675 and the first set lasted 22.days.
SJF
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<richard48@webtv.net> je napisao u poruci:
> Where do you get rechargeable hearing aid batteries?
I didnīt , I just looking for some
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| Peter Weis 2005-05-22, 8:50 am |
| SJF wrote:
> I researched this item several years ago. My recollection is that the
> rechargeable batteries are so limited in electrical storage capacity that
> they would power an ordinary HA only for a few hours compared to about 10
> days for the usual zinc-air batteries. That would quickly become a real
> PITA. As I recall, the batteries were nicad or some equivalent which do not
> have the high energy-density (technical specification) of the zinc-air
> cells.
There has been some development, but capacity is still the problem and
the reason that only size 13 and size 675 are available. Smaller sizes
generally would become useless due to limited lifetime.
Present state of the art is roughly 25% capacity in rechargeables
compared to Zinc-Air, if I remember it corretly.
> Hearing aids generally draw about 1 milliamp of current and this seems to be
> a function of the chip rather than the size of the aid. Your #10, being
> half the size of a #13 would be expected to last about 5 days, rather than
> the 10 days, more or less, of the larger #13. My new BTEs, use the rather
> large #675 and the first set lasted 22.days.
Current consumption is combinged from two components. One is the idle
consumption which largely depends on the chip, the other is the dynamic
consumption which largely depends on the sound levels produced by the
hearing aid.
Standardised tests (IEC and ANSI) defines conditions that rarely brings
the hearing aids more than 50% over the idle consumption. So apparently
most models within a series have the same consumption. This should be in
the 0.6 mA (good) to 1.3 mA (bad) range, depending on chip technologies
and to a limited extent on the transducer quality.
Dynamic consumption in CIC is negligible. At maximum output, the
consumption would be 0.1 or 0.2 mA higher than the idle consumption. In
a high power BTE however, the consumption at maximum output can reach 20
mA or more. This figure is virtually independent of the chip technology.
It depends on the efficiency of the speaker in the device.
So in real life current consumption can depend a lot on the size of the
aid because large hearing aids can produce higher sound lvels than small
ones.
best regards
Peter
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| Bruce Coryell 2005-05-22, 8:50 am |
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Peter Weis wrote:
> SJF wrote:
>
>
>
>
> There has been some development, but capacity is still the problem and
> the reason that only size 13 and size 675 are available. Smaller sizes
> generally would become useless due to limited lifetime.
> Present state of the art is roughly 25% capacity in rechargeables
> compared to Zinc-Air, if I remember it corretly.
>
>
>
>
> Current consumption is combinged from two components. One is the idle
> consumption which largely depends on the chip, the other is the dynamic
> consumption which largely depends on the sound levels produced by the
> hearing aid.
> Standardised tests (IEC and ANSI) defines conditions that rarely brings
> the hearing aids more than 50% over the idle consumption. So apparently
> most models within a series have the same consumption. This should be in
> the 0.6 mA (good) to 1.3 mA (bad) range, depending on chip technologies
> and to a limited extent on the transducer quality.
> Dynamic consumption in CIC is negligible. At maximum output, the
> consumption would be 0.1 or 0.2 mA higher than the idle consumption. In
> a high power BTE however, the consumption at maximum output can reach 20
> mA or more. This figure is virtually independent of the chip technology.
> It depends on the efficiency of the speaker in the device.
> So in real life current consumption can depend a lot on the size of the
> aid because large hearing aids can produce higher sound lvels than small
> ones.
>
> best regards
> Peter
Personally, I don't think rechargeable batteries are worth using in
hearing aids - zinc air batteries are quite cheap and rechargeable
batteries, in general, die after a while and become unreliable, and you
don't want that in a hearing aid.
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| asidline@comcast.net 2005-05-22, 5:51 pm |
| Re rechargeable batteries for h/a, if such exist, is the terminal voltage the same as the zinc-air?
There has been discussions on the current drawn. If the terminal voltage is less, then the current
drawn will be also less. I believe that the lower voltage chargeable batteries may cause clipping
or other non-linearities.
AA batteries provide 1.5 V. Chargeable batteries usually provide 1.2V, a significant difference.
If I am wrong, please correct me.
Alex
On Sat, 21 May 2005 17:08:16 +0200, "Tommy" <tperegli_REMOVE_@inet.hr> wrote:
>Hi !
>
>I get Oticon Syncro CIC model of HA and it is great, but my batteries,
>iCellTech Ultra power, have life of 4-5 days. I would like to buy
>rechargeable batteries bud I didnīt find anything on web. Can somebode help
>me. I just find this http://store.sundancesolar.com/soaidsoheaid.html but
>only for size 13, not for size 10 wich I need.
>
>Thanks
>
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| Alkalines start out higher (1.5V vs. 1.38V) but are below NiMH's 1.2 v
at about 70% discharge. They both drop quickly after the 1.1V point.
NiMH's have lower internal resistance than the Alkalines which helps
the voltage hold up better under load.
asidline@comcast.net wrote:
> Re rechargeable batteries for h/a, if such exist, is the terminal
voltage the same as the zinc-air?
> There has been discussions on the current drawn. If the terminal
voltage is less, then the current
> drawn will be also less. I believe that the lower voltage chargeable
batteries may cause clipping
> or other non-linearities.
> AA batteries provide 1.5 V. Chargeable batteries usually provide
1=2E2V, a significant difference.
> If I am wrong, please correct me.
> Alex
> On Sat, 21 May 2005 17:08:16 +0200, "Tommy"
<tperegli_REMOVE_@inet.hr> wrote:[vbcol=seagreen]
>
batteries,[vbcol=seagreen]
somebode help[vbcol=seagreen]
http://store.sundancesolar.com/soaidsoheaid.html but[vbcol=seagreen]
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| One reason why it is hard to beat the energy density of a zinc-air
battery is the fact that, according to the manufacturers, over a litre
of air is consumed during discharge. Look at the following thread for
more info on zinc-air technology.
Re: avoiding batt, failure at important meetings
Just copy this into the search space for this group. Also, for new
members of the group, be aware that our archives contain a massive data
store on all aspects of hearing loss experience/hardware/in fact
everything.
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| richard48@webtv.net 2005-05-25, 10:52 pm |
| Where do you get rechargeable hearing aid batteries?
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