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http://www.banggood.com/ZNTER-S19-9V-400mAh-USB-Rechargeable-9V-Lipo-Battery-p-1070703.html
A techie friend of mine in Germany is using them for some of his pedals and swears by them (in German though). Here is some of his wordage on these:
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"These rechargeables are different from the typicel NiCad or NiMh. They have a 3,7v Lipo Cell inside (4,2V full, 3,2V empty) and and upward switching regulator, that holds the output voltage constant on 9V. Also a charge curcuit, so you can charge it via micro usb.
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A bit of a warning re very high current capable batteries and I include Sealed Lead Acids.
If a fault, i.e. short develops in the pedal the battery will continue to pump current into circuit and what might have been just a shorted TL072 becomes a complete burn out, PCB, the whole piggin' lot.
I have had this happen in a digital multimeter and now only use conventional alkalines inside gear.
Of course you could protect the circuit with a fuse or fusible resistor.
Under fault/short conditions SLAs swell up and can be a bugger to get out!
Dave.
Bloody hell!!!!! I had no idea that this type of issue could occur and it sounds horrendous. I have never had an issue in the past but if this battery I have ordered is classed as 'high current capable' then I need to be aware and I appreciate the nod!
Cheers
Guy
Hi Guy. Well, I would still be ignorant/unaware had it not happened to me. I am just relieved it was not my personal, rather expensive Fluke 83 that got fried!
Probably the best way to utilize such batteries would be in an external box? This could have multiple co-ax power outs each protected by a 1R dinky fusible R.
Thinking on, you would not wire a gadget directly to a car battery? Of course peeps DO! See them in flames on the M1 now and again!
Dave.
http://www.gear4music.com/Guitar-and-Bass/RockBoard-by-Warwick-Power-LT-XL-Lithium-Ion-Rechargeable-Battery/1FV7
I will have to look into this idea as it does make sense. I don't suppose there is a unit out there that fits the bill as I'm not all that technical?!
Guy
This is a really interesting bit of kit, had no idea anything like this even existed. Thanks also for the link @Grumpyrocker.
The reason I'm using batteries in two pedals is because they don't have DC input but my biggest issue/problem is that I use a Boss RC3 A LOT and when I connect it to the power brick I use it makes the most incredibly irritating noise. No idea at all why or where the noise comes from but it's unusable, particularly at volume. So, I have no choice but to use use the Boss with a battery as the noise disappears completely. I've tried everything I can think of to get rid of the noise when the pedal is hooked up to the brick but no joy. Sooooooo....I wonder if I might have the same problem with the Warwick Rockboard LT?
The reason a battery PSU eliminates this noise is because there's no path back to earth as there is if you've got your pedals plugged into a power socket.
The only thing I'd change about it is I'd add an on/off switch. It's just always on when connected to effects, so I need to unplug it from the daisy chain when I want to stop.
http://i64.tinypic.com/244acyx.jpg