Rechargable 9v

mkane · 3709

0 Members and 1 Guest are viewing this topic.

Offline mkane

  • Full Member
  • ***
    • Posts: 195
on: August 28, 2015, 07:38:48 AM
  We listen 5 houre or more daily and got tired of buying batteries every 130 hours so I bought 8 Powerex 9.6v 230mAh rechargeable with associated charger. Charges in less than 2hrs. The seller claims over 1000 charges over the life of the battery. Sound great, fit well. I have 27 hrs on a charge so far and counting.



Offline boulos

  • Full Member
  • ***
    • Posts: 126
Reply #1 on: August 28, 2015, 08:51:44 AM
I got those same ones too. Note that they charge to ~11.5V when fully charged.



Offline mkane

  • Full Member
  • ***
    • Posts: 195
Reply #2 on: August 28, 2015, 02:27:28 PM
   So far the Quickies up to the task.



Offline denti alligator

  • Hero Member
  • *****
    • Posts: 1149
Reply #3 on: August 28, 2015, 03:37:31 PM
I got those same ones too. Note that they charge to ~11.5V when fully charged.
Bad for Quickie?
Reviews of these aren't great.

How important is the mAh?
« Last Edit: August 28, 2015, 03:39:52 PM by denti alligator »

- Sam

Rega P3-24 (w/AT 150MLX) w/Groovetracer upgrades / Eros II / FLAC >J.River >DSD256 >Gustard X20 / Moreplay > Stereomour II / Klipsch Forte II w/Crites upgrades / C4S S.E.X. 2.0 +Nickel MQ Iron / Speedball Crack / Sennheiser HD600 w/Cardas cable


Offline mkane

  • Full Member
  • ***
    • Posts: 195
Reply #4 on: August 28, 2015, 05:29:29 PM
 36 hrs and counting. The may charge to 11v but how long does that last.



Offline Natural Sound

  • Sr. Member
  • ****
    • Posts: 994
Reply #5 on: August 29, 2015, 05:05:35 AM
Bad for Quickie?
Reviews of these aren't great.

How important is the mAh?

The voltage is fine. Read Paul Joppa's comments here http://bottlehead.com/smf/index.php?topic=1242.msg8571#msg8571

The higher the mAh rating the longer they (should) last.



4krow

  • Guest
Reply #6 on: August 29, 2015, 02:03:59 PM
Rechargables are certainly of interest to me. I am thinking that Li-ion battery would be a good choice for a rechargeable. This might be apples and oranges in some way, but for power tools, Li-ion beats all the others that I have tried. I even have an integrated amp that uses one. Going a step further, I am looking forward to more development of the 'super' capacitor banks that can be used back and forth for a continual power. Thar are said to have much less internal resistance as well.



Offline mcandmar

  • Hero Member
  • *****
    • Posts: 1599
  • Not all engineers are civil
Reply #7 on: August 29, 2015, 02:14:49 PM
I run mine off three 12v sealed lead acid batteries.  I have no idea how long a charge will last, been using them for three months and they are still over 12v each.  Ask me next year :)

M.McCandless


Offline Paul Joppa

  • Global Moderator
  • Hero Member
  • *****
    • Posts: 5751
Reply #8 on: August 30, 2015, 11:43:17 AM
Just a note - the current drain of Quickie is very low, so the high current capacity of power-tool batteries is not used. What counts is often the leakage current. There are low-discharge NiCd cells, NiMH has around twice the leakage of normal NiCd, and lithium-ion cells are even worse. At least, that's how I remember it - been a while since I looked these up.

Paul Joppa


Offline mcandmar

  • Hero Member
  • *****
    • Posts: 1599
  • Not all engineers are civil
Reply #9 on: August 30, 2015, 11:52:59 AM
Worst i have seen are the Green/White"GTL" branded rechargeable Ni-MH 9v's from eBay, out of circuit they fully discharge in about a week. Utterly useless.

M.McCandless


Offline mkane

  • Full Member
  • ***
    • Posts: 195
Reply #10 on: August 30, 2015, 02:38:21 PM
50 hrs. Still sounding right.



Offline WK3K

  • Full Member
  • ***
    • Posts: 83
  • Beginning to see the light...
Reply #11 on: August 01, 2016, 10:02:59 AM
I'm gonna taking the plunge on the rechargeable's as well. @mkane, are you still happy with the Powerex? It looks like they just introduced a new line this year: http://www.mahaenergy.com/blog/new-line-of-batteries-powerex-precharged/.

They now offer two different versions of 9v batteries: one at 9.6v and 230mah and the other at 8.4v and 300mah. I seem to remember another thread in which someone said the higher the mah, the longer the batteries should last. PJ has mentioned in the past that even 7.2v batteries would be enough to drive the quickie, and headroom isn't really a problem for me.

I'm trying to get the most milage per charge, so I'm thinking the 8.4v at 300mah is the way to go. Anyone have any thoughts before I pull the trigger?

Witold

Witold

Rega P3-24 w/ Rega Exact > Eros II> Quickie w/PJCCS > Stereomour II w/ DC filament supply > Blumenstein Orca Mini/Max 2.1

MacBook > Grace SDAC > Crack w/ Speedball > Sennheiser HD6XX


Offline Paul Joppa

  • Global Moderator
  • Hero Member
  • *****
    • Posts: 5751
Reply #12 on: August 01, 2016, 02:47:40 PM
If you squeeze the longest life you can from alkaline "9v" batteries, they will drop from 9v to 6v, so the design was centered at 7.5v per battery. NiCd and NiMH batteries hold their voltage pretty constant until the charge is mostly used up. I stand by my opinion that anything above 7v is adequate for most systems.

Paul Joppa


Offline WK3K

  • Full Member
  • ***
    • Posts: 83
  • Beginning to see the light...
Reply #13 on: August 02, 2016, 05:54:29 AM
Hey thanks PJ. I'm going to pull the trigger on these and I'll report back on the mileage.

Best,

Witold

Witold

Rega P3-24 w/ Rega Exact > Eros II> Quickie w/PJCCS > Stereomour II w/ DC filament supply > Blumenstein Orca Mini/Max 2.1

MacBook > Grace SDAC > Crack w/ Speedball > Sennheiser HD6XX


Offline mkane

  • Full Member
  • ***
    • Posts: 195
Reply #14 on: August 02, 2016, 10:10:06 AM
I'm gonna taking the plunge on the rechargeable's as well. @mkane, are you still happy with the Powerex?



 Still quite satisfied