Become a Site Supporter and Never see Ads again!

Author Topic: Cheap 9v Li-Ion batteries?  (Read 3913 times)

0 Members and 1 Guest are viewing this topic.

Offline Chuck

  • Trade Count: (42)
  • Needs to get out more...
  • *****
  • Posts: 10687
  • Gender: Male
  • time between the notes...
    • My recordings on the LMA
Cheap 9v Li-Ion batteries?
« on: March 07, 2013, 03:11:19 PM »
Are any of you using these?

http://www.batteryspace.com/Li-Ion-9V-500mAh-4.5Wh-Rechargeable-Battery.aspx

I wonder about them, because they are only $3.60 each. They are 500mAh 7.2v (nominal) rechargeable batteries. The charger is $10.

http://www.batteryspace.com/smartcharger03afor9vli-ionpolymerrechargeablebatterypackwithplasticend--celisted.aspx

Typical NiMh batteries of the same size and voltage are ~175mAh and in the $10 each range. That makes the Li-Ion's pretty cheap.  :facepalm:



Reality is merely an illusion, albeit a very persistent one.

Microphones: Microtech Gefell M300, AKG C 480 B comb-ULS/ CK 61/ CK 63, Sennheiser MKE 2 elements, CAD GXL1200 (cardioid and mod-cardioid capsule & electronics mod), Audix M1290-o, Micro capsule active cables w/ Naiant PFA's, Naiant MSH-1O, Naiant AKG Active cables, Church CA-11 (cardioid), (1) Nady SCM-1000 (mod)
Pre-amps: Naiant littlebox, Naiant littlekit v2.0, BM2p+ Edirol UA-5, Church STC-9000
Recorders: Sound Devices MixPre-6, Tascam DR-680, iRiver iHP-120 (Rockboxed & RTC mod)

Recordings on the LMA: http://www.archive.org/bookmarks/ChuckM
Recording website & blog: http://www.timebetweenthenotes.com

kirk97132

  • Guest
  • Trade Count: (0)
Re: Cheap 9v Li-Ion batteries?
« Reply #1 on: March 07, 2013, 04:32:28 PM »

Are any of you using these?

http://www.batteryspace.com/Li-Ion-9V-500mAh-4.5Wh-Rechargeable-Battery.aspx

I wonder about them, because they are only $3.60 each. They are 500mAh 7.2v (nominal) rechargeable batteries. The charger is $10.

http://www.batteryspace.com/smartcharger03afor9vli-ionpolymerrechargeablebatterypackwithplasticend--celisted.aspx

Typical NiMh batteries of the same size and voltage are ~175mAh and in the $10 each range. That makes the Li-Ion's pretty cheap.  :facepalm:

SO in essence they the same as a lot of rechargables and do not put out 9V.  Equipment they are being used on would need to be able to work in the 7volt world and not expect to see 9volts.  Might make soem equipment shut down if it sensed it as low voltage and/or might not perform right using 7volts instead of 9

Offline bryonsos

  • Omni addict
  • Trade Count: (28)
  • Needs to get out more...
  • *****
  • Posts: 2062
  • Gender: Male
  • If it's important, tell me to write it down.
    • LMA uploads
Re: Cheap 9v Li-Ion batteries?
« Reply #2 on: March 07, 2013, 04:38:46 PM »

Are any of you using these?

http://www.batteryspace.com/Li-Ion-9V-500mAh-4.5Wh-Rechargeable-Battery.aspx

I wonder about them, because they are only $3.60 each. They are 500mAh 7.2v (nominal) rechargeable batteries. The charger is $10.

http://www.batteryspace.com/smartcharger03afor9vli-ionpolymerrechargeablebatterypackwithplasticend--celisted.aspx

Typical NiMh batteries of the same size and voltage are ~175mAh and in the $10 each range. That makes the Li-Ion's pretty cheap.  :facepalm:

SO in essence they the same as a lot of rechargables and do not put out 9V.  Equipment they are being used on would need to be able to work in the 7volt world and not expect to see 9volts.  Might make soem equipment shut down if it sensed it as low voltage and/or might not perform right using 7volts instead of 9

Plus, they admit they are a bit larger. I can see them getting stuck/harder to remove from a lot of gear.
Mics: 3 Zigma Chi HA-FX (COL-251, c, h, o-d, o-f) / Avenson STO-2 / Countryman B3s
Pres: CA-Ugly / Naiant Tinyhead / SD MixPre
Decks: Roland R-44 / Sony PCM-M10
GAKables
Dead Muppets

My recordings LMA / BT / TTD

Offline Cheesecadet

  • Trade Count: (21)
  • Needs to get out more...
  • *****
  • Posts: 2784
  • Gender: Male
  • http://db.etree.org/cheesecadet
Re: Cheap 9v Li-Ion batteries?
« Reply #3 on: March 07, 2013, 05:46:08 PM »
Just out of curiosity...how do these companies getting away with naming something 9 volt if it only puts out 7.2 volts???  Is it just because they have the same shape or something?
6/14 Aggrolites, 6/19 FirstGrass, 6/20 TBF, 7/16-17 SCI, 8/9-10 MH , 8/30-31 Phish, 9/05 Aggrolites, 9/29 Lauren Daigle

Offline Todd R

  • Over/Under on next gear purchase: 2 months
  • Trade Count: (29)
  • Needs to get out more...
  • *****
  • Posts: 4886
  • Gender: Male
Re: Cheap 9v Li-Ion batteries?
« Reply #4 on: March 07, 2013, 06:25:13 PM »
Just out of curiosity...how do these companies getting away with naming something 9 volt if it only puts out 7.2 volts???  Is it just because they have the same shape or something?

A 9v alkaline battery is actually made with 6x 1.5v cells.  If you look at a typical 1.5v battery, they drop quickly from 1.5v and spend most of their life at 1.1v to 1.2v.  Hence, a 9v battery spends most of its life at ~6.8v - 7.2v.  Do a search on 9v alkaline battery discharge curve, and you can see what I mean. Li-ion batteries have a much flatter discharge curve, so a 3.7v li-ion battery spends a lot of its life at 3.4v to 3.7v, so in use, a two-cell li-ion battery is not much different than a 9v battery.

Equipment designed to use a 9v alkaline battery and actually needed 9v (or more than say 8v), would not operate for very long using a 9v battery.  I'd guess most designs are assuming more like 6.5-7v as a cutoff from a 9v battery.
Mics: Microtech Gefell m20/m21 (nbob/pfa actives), Line Audio CM3, Church CA-11 cards
Preamp:  none <sniff>
Recorders:  Sound Devices MixPre-6, Sony PCM-M10, Zoom H4nPro

Offline Chuck

  • Trade Count: (42)
  • Needs to get out more...
  • *****
  • Posts: 10687
  • Gender: Male
  • time between the notes...
    • My recordings on the LMA
Re: Cheap 9v Li-Ion batteries?
« Reply #5 on: March 07, 2013, 06:56:12 PM »
I found a nice efficient 6-8v to 48v DC circuit I want to put into my littlekit. I found I don't like charging up (5) 9v NiMh batteries when I want to use it. So, I haven't been using it as much as I should.

These look like a good way to generate the 6-8v DC I need for that circuit. If I run two of these batteries in parallel and use a smart charger I get 1000mAh for $7.20! Two of these beauties will fit into the littlekit box too. I can't see a downside to them yet. I just wonder why they are so inexpensive?

Reality is merely an illusion, albeit a very persistent one.

Microphones: Microtech Gefell M300, AKG C 480 B comb-ULS/ CK 61/ CK 63, Sennheiser MKE 2 elements, CAD GXL1200 (cardioid and mod-cardioid capsule & electronics mod), Audix M1290-o, Micro capsule active cables w/ Naiant PFA's, Naiant MSH-1O, Naiant AKG Active cables, Church CA-11 (cardioid), (1) Nady SCM-1000 (mod)
Pre-amps: Naiant littlebox, Naiant littlekit v2.0, BM2p+ Edirol UA-5, Church STC-9000
Recorders: Sound Devices MixPre-6, Tascam DR-680, iRiver iHP-120 (Rockboxed & RTC mod)

Recordings on the LMA: http://www.archive.org/bookmarks/ChuckM
Recording website & blog: http://www.timebetweenthenotes.com

Offline F.O.Bean

  • Team Schoeps Tapir that
  • Trade Count: (126)
  • Needs to get out more...
  • *****
  • Posts: 40689
  • Gender: Male
  • Taperus Maximus
Re: Cheap 9v Li-Ion batteries?
« Reply #6 on: March 07, 2013, 07:49:16 PM »
I would stick w alkaline/NIMH 9v's ;)
Recording Gear:
Schoeps MK 4 (MP) & MK 41V (MP) Capsules ->
Schoeps 250/0 KCY's X2 ->
Naiant +60v/Low Noise PFA's x2 ->
DarkTrain Right Angle Stubby XLR's x2 ->
Sound Devices MixPre-6 & MixPre-3 ->
SanDisk 128gb Extreme Pro & 64gb Ultra Plus

Portable Playback Gear:
Campfire Audio Andromeda & Dorado IEM's ->
Linum G2 SuperBax & Bax 3.5mm | FiiO LC 2.5c 2.5mm ->
Shanling Audio M5s | Sony NW-A35 DAP's

DAW:
Dell Inspiron 5570-5521 SLV Laptop
(Pentium i5/8gb RAM/256gb SSD)

http://www.archive.org/bookmarks/diskobean | http://www.archive.org/bookmarks/Bean420 | http://bt.etree.org/mytorrents.php

Offline Chuck

  • Trade Count: (42)
  • Needs to get out more...
  • *****
  • Posts: 10687
  • Gender: Male
  • time between the notes...
    • My recordings on the LMA
Re: Cheap 9v Li-Ion batteries?
« Reply #7 on: March 07, 2013, 09:36:36 PM »
Batteryspace has a hazmat handling fee for lithiums that will drive up the cost of a small battery purchase though.

Does that apply to the battery packs too?
Do they apply that during check-out? Because I put a couple into the cart and there is no mention of a hazmat fee.
Reality is merely an illusion, albeit a very persistent one.

Microphones: Microtech Gefell M300, AKG C 480 B comb-ULS/ CK 61/ CK 63, Sennheiser MKE 2 elements, CAD GXL1200 (cardioid and mod-cardioid capsule & electronics mod), Audix M1290-o, Micro capsule active cables w/ Naiant PFA's, Naiant MSH-1O, Naiant AKG Active cables, Church CA-11 (cardioid), (1) Nady SCM-1000 (mod)
Pre-amps: Naiant littlebox, Naiant littlekit v2.0, BM2p+ Edirol UA-5, Church STC-9000
Recorders: Sound Devices MixPre-6, Tascam DR-680, iRiver iHP-120 (Rockboxed & RTC mod)

Recordings on the LMA: http://www.archive.org/bookmarks/ChuckM
Recording website & blog: http://www.timebetweenthenotes.com

kirk97132

  • Guest
  • Trade Count: (0)
Re: Cheap 9v Li-Ion batteries?
« Reply #8 on: March 08, 2013, 10:43:26 AM »
Just out of curiosity...how do these companies getting away with naming something 9 volt if it only puts out 7.2 volts???  Is it just because they have the same shape or something?

A 9v alkaline battery is actually made with 6x 1.5v cells.  If you look at a typical 1.5v battery, they drop quickly from 1.5v and spend most of their life at 1.1v to 1.2v.  Hence, a 9v battery spends most of its life at ~6.8v - 7.2v.  Do a search on 9v alkaline battery discharge curve, and you can see what I mean. Li-ion batteries have a much flatter discharge curve, so a 3.7v li-ion battery spends a lot of its life at 3.4v to 3.7v, so in use, a two-cell li-ion battery is not much different than a 9v battery.

Equipment designed to use a 9v alkaline battery and actually needed 9v (or more than say 8v), would not operate for very long using a 9v battery.  I'd guess most designs are assuming more like 6.5-7v as a cutoff from a 9v battery.

Todd, I am going to disagree with you hard about this.  Any 1.5volt battery that is below 1.3 volts will not run most equipment.  And a new battery voltage test at 1.58-1.60 volts. We use AA batteries(also a 1.5volt battery) in our wireless mics at work and once the battery hits 1.3volts the mics shut off.  So I beleiev it is a wrong assumption to believe that a battery spends it's life in the 1.1-1.2volt range. 

kirk97132

  • Guest
  • Trade Count: (0)
Re: Cheap 9v Li-Ion batteries?
« Reply #9 on: March 09, 2013, 12:56:26 PM »
I agree Jon, I pull them and re-purpose them in my flashlights, kids toys remotes etc.  I refuse to toss them until I have drained them to dead.  I guess my point was I don't beleive that they drop off imdeiately to 1.1 - 1.2 volts where they spend mot of their life.  Rather they have a gradual discharge curve that is way above those kinds of numbers.

Offline Chuck

  • Trade Count: (42)
  • Needs to get out more...
  • *****
  • Posts: 10687
  • Gender: Male
  • time between the notes...
    • My recordings on the LMA
Re: Cheap 9v Li-Ion batteries?
« Reply #10 on: March 09, 2013, 01:49:13 PM »
I e-mailed batteryspace about these batteries. They are not going to work for my purpose, but I still can't believe how cheap they are. Thomas Distributing is selling similar Li-Ion 9v batteries in the $17 - $20 each range. http://www.thomasdistributing.com/9V-Lithium-Polymer-Batteries_c_958.html
Reality is merely an illusion, albeit a very persistent one.

Microphones: Microtech Gefell M300, AKG C 480 B comb-ULS/ CK 61/ CK 63, Sennheiser MKE 2 elements, CAD GXL1200 (cardioid and mod-cardioid capsule & electronics mod), Audix M1290-o, Micro capsule active cables w/ Naiant PFA's, Naiant MSH-1O, Naiant AKG Active cables, Church CA-11 (cardioid), (1) Nady SCM-1000 (mod)
Pre-amps: Naiant littlebox, Naiant littlekit v2.0, BM2p+ Edirol UA-5, Church STC-9000
Recorders: Sound Devices MixPre-6, Tascam DR-680, iRiver iHP-120 (Rockboxed & RTC mod)

Recordings on the LMA: http://www.archive.org/bookmarks/ChuckM
Recording website & blog: http://www.timebetweenthenotes.com

Offline Jamos

  • Trade Count: (58)
  • Taperssection All-Star
  • ****
  • Posts: 1628
  • Gender: Male
Re: Cheap 9v Li-Ion batteries?
« Reply #11 on: March 13, 2013, 10:40:19 PM »
We use the iPower 9v 520mAh LiPoly batteries at work in wireless mic packs all the time -- and they work really, really well.
They operate at 8.4v (like most NiMh rechargeables also do), but last about 2x as long as the NiMh equivalents. 

Some devices that are calibrated for alkalines will read "low battery" when inserting a fresh iPower because of the 8.4v, but they still run a long time.

I'm not sure a 7.2v battery would function well in a lot of 9v applications, but I could be wrong.

Offline Red Boink

  • Trade Count: (27)
  • Taperssection Regular
  • **
  • Posts: 230
Re: Cheap 9v Li-Ion batteries?
« Reply #12 on: March 25, 2013, 03:23:13 AM »
I use the ipower lipoly 9v in eight lectrosonics wireless mics and they work great.  Haven't had a failure in years  of service.  Well worth the extra price.  Nothing truly well made comes cheap.  I'm still using nimi np1s in my cooper mixer, and fostex fr2, but next buying cycle,may switch to lion for those too. 

Best,

John

 

RSS | Mobile
Page created in 0.152 seconds with 40 queries.
© 2002-2019 Taperssection.com
Powered by SMF