Rechargable 9v

[mkane]

  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.

[boulos]

I got those same ones too. Note that they charge to ~11.5V when fully charged.

[mkane]

   So far the Quickies up to the task.

[denti alligator]

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?

[mkane]

 36 hrs and counting. The may charge to 11v but how long does that last.

[Natural Sound]

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]

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.

[mcandmar]

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

[Paul Joppa]

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.

[mcandmar]

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.

[mkane]

50 hrs. Still sounding right.

[WK3K]

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

[Paul Joppa]

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.

[WK3K]

Hey thanks PJ. I'm going to pull the trigger on these and I'll report back on the mileage.

Best,

Witold

[mkane]

I'm gonna taking the plunge on the rechargeable's as well. @mkane, are you still happy with the Powerex?

 Still quite satisfied