Yet another dynamo related question...

[Ben98]

Does anyone know of a battery pack that will charge and be charged at the same time and has 2 USB outputs on it?
Thanks in advance
Ben

[Mark E]

I've got a fuel 2000mah battery that cost £9.50 off Amazon that can charge and discharge. However, it only has one USB port, the other is a micro USB out that I connect to a sinewave USB charger. The USB out from the battery then goes to my gps to prevent the annoying "external power lost" prompt that appears when you drop below about 9km/h. Works well, although I think I read somewhere that simultaneous charge/discharge isn't great for the battery?

[Dave42w]

I use a TeckNet® POWER BANK 15000mAh USB External Battery http://www.amazon.co.uk/gp/product/B00FBCJ184

Has a "normal" 1A and a "high" 2.1A output. Obviously if you are charging 2 devices at the same time as it is connected to the mains you are going to take power out faster than you put it in.

[Ben98]

What I'm thinking now is, have 2 of the same battery pack (about 5000mah) with 2 USB outs each, and charge one from the dynamo while the other charges my devices. This gives me charging during the day, and the capacity to have 10000mah stored should I need it
I think that makes sense?

[Wotsits]

They've got these in at Cosco atm-

http://uk.maxell.eu/en/products/5200mah-silver-692.aspx

Can check on the price for you tomorrow if you're interested Ben.
But i've no idea if it can charge & be charged at the same time. Was probably going to get one myself soon, so could poss check for you then.

EDIT: These are £24 (inc vat) in Cosco, 2x outputs, a good size, 140g weight (to be confirmed) & charge indicator.
Doesn't look like they can charge whilst being charged though..

[Dave42w]

What I'm thinking now is, have 2 of the same battery pack (about 5000mah) with 2 USB outs each, and charge one from the dynamo while the other charges my devices. This gives me charging during the day, and the capacity to have 10000mah stored should I need it
I think that makes sense?

That is pretty much exactly what I plan to use for my sabbatical. I want to keep phone, nexus 7 tablet, Garmin (not sure which one yet as I need to upgrade my 800 to get Bluetooth/wifi), kindle, Bluetooth keyboard all running for up to about 10 days.

I have a Tout Terrain Plug II to do the charging from my Schmidt Son 28 although I think the technology is improving fast.

[Alpinum]

Does anyone know of a battery pack that will charge and be charged at the same time and has 2 USB outputs on it?
Thanks in advance
Ben

The Forumslader
http://www.forumslader.de/
If you're interested I can help with info, contact and stuff.

[BenS]

The Forumslader
http://www.forumslader.de/
If you're interested I can help with info, contact and stuff.

I have one of the 'automatic 4 stage' ones and it's brilliant. Use it cycle touring where it powers GPS/charges phones (you'll need to mod a cable to get an iphone to charge from it) and runs lights. I also use it commuting to run my lights.

[Ben98]

So am I missing something here? All the things such as the plug 2/3 and the sinewave, are basically to stop the voltage getting high enough to fry the device being charged? So they do the same job as the shimano SM-DH10 overvoltage protector that comes with the XT dynamo hub?

[johnnystorm]

That just stops you frying a rear light, I don't think it converts the output to a specific 5v output (or provides a handy usb socket).