Rechargeable 9V life?

nsmar4211 · #1 07-04-2010, 02:27 PM

Anyone use these? Saw em at best buy, got two and the charger. Figured I can use em in the pedals I don't play enough to warrant buying "good" batteries if it turns out they suck. Mine are the energizer brand......wondering if they last as long as normal ones between needing charging....

Exploiter8 · #2 07-04-2010, 02:33 PM

Generally, 9 volts, no.

They lack the necessary mah's (milliamp hours) to last an evening, plus, they aren't a low rate of discharge cell meaning they will discharge fairly rapidly even in storage.

IMO

JTE · #3 07-06-2010, 08:14 AM

Another thing to note about rechargable 9V batteries is that fully charged, they're never at 9 VDC anyway. I think they top out around 8.25 (I don't recall the exact number), but many electronic circuits stop working around 7.5 VDC. So there's not much room there for the battery to work for you.

My choice is to have GOOD alkaline batteries in everything (I'm very prejudiced against Eveready batteries- my personal experience is that they just don't last reliably as long as DuraCell or DuraCell's bulk version,Pro-Cells). And I use AC adaptors for everything. Most stomp boxes still need a battery in them, but using the AC adaptor eliminates the hassle of having to change batteries very often at all. I check the batteries in my pedal boards about once a year (when we switch to Daylight Savings Time in the spring- same day I put new batteries in the smoke alarm and CO detector).

John

Richland123 · #4 07-06-2010, 08:23 AM

I used to use NiCad 9V batteries years ago in my bass and they worked fine for a long time and lasted a few months between charges. However, you need to have an extra fully charged battery on hand at all times just in case you need it. Also, after time, the memory and the length of charge time decreases with each use. I now use heavy duty alkaline batteries in my bass and if you have a Big Lots store close by, they are very reasonably priced there.

rtslinger · #5 07-07-2010, 12:34 PM

not worth the cash they are expensive! I tried they died pretty quick and they do not hold a true 9 volt charge the best and most expensive I had looked at 8.5 and that decrease with time not good for our needs.

walterw · #6 07-07-2010, 10:55 PM

they make sense in high-drain stuff like wireless units, where you're putting in a new battery every gig or two, but not low-drain stuff like basses or pedals, which can keep a regular alkaline for months or even years.

for that high-drain app, you don't want anything but these.

lithium-ion is the future! they actually last as long or longer than real alkaline 9Vs.

MasterMonkeyMan · #7 07-07-2010, 11:39 PM

I have been using Powerex True 9.6V Long Lasting Rechargeable batteries with no problem.

http://www.mahaenergy.com/store/view...?idproduct=273

Testing with a volt meter right after charging indeed shows 9.5 ~ 9.6 Volts.
I have had one in my Warwick Katana 5 NT for a couple of months now. No problems yet.

ggunn · #8 07-08-2010, 06:14 PM

Quote:

Originally Posted by JTE

I use AC adaptors for everything. Most stomp boxes still need a battery in them, but using the AC adaptor eliminates the hassle of having to change batteries very often at all.

Not so; if you have a AC to 9V power supply you can run stomp boxes without a battery. I do it all the time.

JTE · #9 07-09-2010, 11:53 AM

Quote:

Originally Posted by ggunn

Not so; if you have a AC to 9V power supply you can run stomp boxes without a battery. I do it all the time.

Depends on the stomp box. The Boss pedals I have work fine, the Cry Baby and the Reverend Drive Train don't.

John

xgator4u · #10 07-09-2010, 07:48 PM

I use them in my wireless, charge them up, pop it in before playing, and good to go. However don't think you can charge a bunch up in advance and have them ready, cause they will bleed down on you pretty quick. I got them cause I got tired of buying batteries.

nsmar4211 · #11 07-10-2010, 11:27 AM

So you guys think that putting two of em into an 18v active bass is going to be trouble cause they'll drain too fast?....hrm.....

Think what I'll do is pop em in, and do a few practice sessions and see how much they drain. Too much and I'll keep em for pedals (I don't use pedals at a gig, just to play around with) and breadboarding stuff

.

$20 a battery.....whooooooo....... and I thought $10 a battery was expensive... are those rechargeables really that great?