Curious about FREMO P201A external battery: Li-Ion? Ni-Cad? Other? Use with ff cam?

[L_D_Allan]

I'd hoping to get info on the FREMO P201A external battery:

• http://www.newegg.com/Product/Product.aspx?Item=N82E16875790061
• I checked with Fremo's tech support, and their reply was "has a Lithium battery" ...
• The Wiki article on "Lithium Battery" mentions it is disposable (non-rechargeable). Huh?
• https://en.wikipedia.org/wiki/Lithium_battery
• My less-than-informed understanding is that Li-Ion batteries have a chemistry with "native voltage" of about 7.2 V
• The FREMO seems to have a "native voltage" of 5.1 V, and a claimed capacity of 20,000 mAh.
• I'm especially hoping that the FREMO can be used as an external battery to the relatively low capacity Sony NP-FW50 with about 1020 mAh at 7.2 V for Sony a7Rii full frame mirrorless camera.
• However, the 7.2V vs 5.1V makes me concerned. I really don't want to risk harming my camera with incompatible voltages.
• I want to be able to do 4 to 6+ hour star trails with the FREMO connected to the USB charging port of the Sony a7Rii.
• On cool evenings, the Sony a7Rii will last about 90 minutes doing 30 sec star-trails in time-lapse mode.
• Oddly, the P201A is not shown on the ifremo.com website. http://www.ifremo.com/category/10
• The P201A definitely seems rechargeable, and has an LCD readout with what appears to be useful info.

 

[HKJ]

Lithium batteries are primary batteries with 3 volt.
LiIon batteries are rechargeable batteries often with 3.7 volt nominal (4.2 volt when charged).

The pack looks to be using a LiIon battery in the shape of a lithium polymer pack (Same as mobile phones) with probably 3.7 volt nominal voltage. In addition to this battery it has a boost converter to make 5 volt output and a charge circuit to charge the battery from 5 volt.

I have tested a few of these battery packs here: http://www.lygte-info.dk/info/indexUSB UK.html (You will have to page a bit down).

 

[Timothybil]

I would question the 20000 mAh rating on the power pack. Even using a lithium polymer cell, that seems like a lot of capacity for such a slim package.

 

[L_D_Allan]

I'd hoping to get info on the FREMO P201A external battery:

Thanks for the replies.

I did get a reply from FREMO ... indicating their P201A is Li-Ion. It seems to work fine for charging a low smart-phone. I haven't tried it yet with the Sony full-frame a7Rii, or an ASUS 10" Intel Atom laptop.

 

[L_D_Allan]

I haven't tried it yet with the Sony full-frame a7Rii, or an ASUS 10" Intel Atom laptop.

Works well to charge the battery, and also as an external battery to extend the count of shutter activations from about 300 to 1500+.