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PP3 LITH BATTERIES USB CHARGEABLE.
 Moderated by: W C Greene
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 Posted: Wed Aug 30th, 2017 08:28 am
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William M
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https:http://www.banggood.com-search-9v-400mah-usb-rechargeable-9v-lipo-battery.html.html]battery.html.html]
https://www.banggood.com/search/9v-800mah-usb-rechargeable-9v-lipo-battery.html
 
https://www.banggood.com/ZNTER-Micro-USB-Charging-Cable-for-USB-Rechargeable-Battery-p-1069772.html?rmmds=search
 
You have a choice of  the number of leads as regards number of batteries to charge from same supply.....(This lead is NOT a standard MINI USB lead). It is a special one.

Last edited on Wed Aug 30th, 2017 08:36 am by William M



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 Posted: Wed Aug 30th, 2017 12:01 pm
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Helmut
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Here's a test report. The useable capacity @80mA is just ~320mAh, and there are some other reservations. But within the limitations, it's said to be OK.

BTW: if you want to charge up to four cells at once, and have a standard USB hub, you can use that instead - provided you have the cables.

PPS: A comparison test of several brands

Last edited on Wed Aug 30th, 2017 12:36 pm by Helmut



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 Posted: Fri Sep 1st, 2017 09:08 am
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William M
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I am just wondering whether the Lith batteries when new take a few charges/discharges to get to their advertised milliamp rating. Storage before sale may affect the batteries as liths drop approx 10% a month (so its said).
Another tester said that the 400mah battery reached about 360mah...so...seems its a lucky dip really.....:old dude:



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 Posted: Fri Sep 1st, 2017 08:06 pm
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Helmut
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before all sorts of second-hand hear-say about LipOs starts to float around - read here first.



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 Posted: Sat Sep 2nd, 2017 05:40 pm
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Bob R
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Looking at the video the cells appear to be 420 mah rated.  The battery also has a protection circuit that prevents over discharge among other things.  My experience with the protection circuits has been that they can vary in the actual low voltage and high voltage cutoff points.  Depending on the cutoff point you may not get the full rated mah in usage. 



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 Posted: Sat Sep 2nd, 2017 10:26 pm
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Helmut
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Isn't that exactly what the tester is telling us? The first two brands reach 98% of rated capacity, the others show larger differences.
BTW, don't be fooled by these 6F22's being advertised as 9V blocks. They aren't. Their operating voltage is ~7.4V, what one expects from a 2S LiPo. But compared to the OK cell, there is no ripple in the output, and they have double the capacity. What counts is the energy available, which is ~2.9Wh for the OK, whereas the EBL has ~5.9Wh. Energy is VoltagexAmpHrs! The 2S have another advantage - they can be safely loaded with 1C current, which is 0.6A. I doubt the stepup regulator in the OK is capable of that.



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 Posted: Tue Oct 3rd, 2017 06:31 pm
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chasv
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got a battery charge set up the other day the batteries (6) plug into charger all 6 and it is usb to wall wart red light goes out as they are charged batteries are labeled BTG 3.7 volts 600 mah about 1 3/4" long 1" wide 3/8" thick



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