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 quantity In stock 204 in stock 14.95 retail price 13.46 1+ units

limit of 2 per customer

Skills

Description: Power on the go? Why didn't you ask? We've got plenty! These portable, rechargeable lithium-polymer battery packs are simple, compact and make for a great way to power your widgets in the field. Best of all, they're dead simple to operate: Just connect your device to the USB-A port on the battery pack and press the power button. An LED will alert you to the charge level of the battery and start powering your device. The battery pack will turn off on its own when your device stops drawing power from it. To recharge the battery pack, just plug it into your computer or phone charger using a USB micro-b cable.

This particular battery pack has an 1800mAh capacity and will source 700mA at 5.5VDC.

Note: Our latest shipment of these actually have an 1800mAh battery instead of a 2000mAh.

Note: Due to shipping restrictions, only two batteries can be shipped together at one time. We should be able to ship more than two batteries at a time by the end of 2014.

Dimensions: 13.5 x 54.2 x 95mm

Documents:

• Details please. How long will it source 700mA at 5.5VDC? Battery is 2000mAh, but which voltage?

From charger datasheet, we can infer its a single cell. Output is 5.5v, so we can infer it has a boost circuit. Where is the datasheet? What is the efficiency of said circuit?

Because I’d prefer a “1000mAh battery pack with 90% efficient boost circuit” over a “2000mAh with 40% efficient boost”, even if it looks less beefy…

To potential customers… do not assume this will give you 2 * 3.7/(0.7 * 5.5)=1.9 hours while draining 700mA.

• You can easily assume:

Li-Ion battery, nominal 3.7V (that’s what they’re typically these days.)

90% efficient boost circuit. (maybe 88%? Maybe 92%? but that’s a minor difference.)

So 2000mA(3.7/5.5).9 = 1.210Ah. NOTICE: That 2000mAh is on an excessive discharge. typically, you never want to run below 20%, and 30% would be even better, to ensure longterm usability. It’s less important with a 1Cell device, but still important. So consider further derating this.

Regards :).

• Could someone explain to me why it’s cheaper to buy this than just the battery alone? I could save \$2 by buying one of these and taking the battery out. Seems silly to me, unless I’m missing something.

• The arduino doesn’t have enough load to keep the battery on. Add a led or resistor to increase the load on the battery. Watch the video, this is explained..

• Does anyone know the minimum current draw to keep the battery on? I’m using it to power some LEDs and I don’t think they are pulling enough current to keep the battery on– it shuts off after 10 seconds or so.

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SparkFun is an online retail store that sells the bits and pieces to make your electronics projects possible. Whether it's a robot that can cook your breakfast or a GPS cat tracking device, our products and resources are designed to make the world of electronics more accessible to the average person. In addition to products, SparkFun also offers classes and a number of online tutorials designed to help educate individuals in the wonderful world of embedded electronics.