Radio shack battery charger when it first came out

#Radio shack battery charger when it first came out how to#
#Radio shack battery charger when it first came out series#

Please note that the charger will see now the sum R_bat + R_ext. The value of the resistor is likely small (we can start with 1О© for example) and find out from which value the charger starts to complain and signals it is a bad battery.

#Radio shack battery charger when it first came out series#

Then we insert externally a resistor R_ext (as if it were internal) in series between one terminal of the charger and the corresponding pole of the battery. On the other hand, perhaps we can check the validity of this 'internal resistance' idea for a charger by doing just the opposite as it follows:ДЇirst, we find a good battery that the charger can charge it normally. Then we remove the resistor and notice how much the battery voltage drops (Vbat1-Vbat2): We measure the two voltages V_res on the resistor (R_ch) and V_bat1 on the battery. One easy method is to wire the battery as if we like to charge it via a resistor. If the charger refuses to continue charging the battery though its voltage is nominal then we can conclude that it detects its internal resistance (R_bat) first which usually increases with time. But if dissipation is not a problem (by using a power resistor or many resistors in parallel, series or both, to get R_ch), using 12V for example can let the charging current be rather constant while V_bat is increasing with time. R_ch = (Vcc - V_bat) / I_ch (worst case is when V_bat=0)ДЇrom the formulas above it is better to choose a low Vcc to decrease dissipation (not higher than 5V). The charging current (I_ch) doesn't have to be high since we are not in a hurry :wink: This can be done via a resistor and a DC supply. If its voltage is too low then we should try charging it with a simple method till it restores its nominal voltage.

#Radio shack battery charger when it first came out how to#

My phone will bluetooth in a call & I admit, I feel pretty high-tech & it's awesome! All in a cute but not high-end car & my over 200 yo farmhouse, ha, ha! I deal with a lot of health issues & now estate stuff, so I try to make each moment good.Sorry, I couldn't get your point on how to let the charger see the battery as having internal low impedance.Д«y the way, I supposed that measuring the voltage of the old battery gives a nominal value (for example like 1.2V or a bit less). It seems to work fine, though certainly a bit Frankenstein-ish! I might have all that plugged in, my phone as a mobile hotspot, streaming a Google hangout on my Prime (docked, suited & sitting up facing me on the passenger seat) and my phone also streaming music (online playlist from 8Tracks if I really want to guzzle some data!). lighter into 2 so I can, in total, charge my Garmin GPS & Atrix phone via the cig lighters & my Prime with an additional, regular Asus power plug. I actually use an additional Radio Shack splitter to divide the new cig. I don't mean to be a smartass & I do not know all the step-downs, etc., but I just use a Radio Shack splitter that gives me a cigarette lighter & a 3-prong plug (this is all working in the US anyway). My Transformer Prime and my phone are both charging nicely as we speak. The second benefit of this charger is that you can simultaneously charge your phone, in my case an HTC LTEvo, but it can be essentially any phone including an iPhone.

Then voila - done! It sounds complicated, but it's not really, and once you set it up you don't need to take it apart again. To make it work: a) you plug the included 12v cable into the Astro 3, then b) you plug in one of the included power size adapters into the 12 volt cable (you'll figure out which one), then c) you plug in the included power-to-USB cable into the power size adapter, then d) you plug in the female-to-female USB connector that you purchased, then e) you plug in your original USB-to-Transformer Prime cable.

But with the purchase of a Female-to-Female USB connector (I bought mine at Fry's, but Amazon also has them) you can make it work.Д¬onnecting it up - It uses a few of the connectors that come in the box. Second - there is NO connector in the box that fits the proprietary power/data connector for the Transformer Prime. Other chargers might work too, but make sure one of the outputs is a minimum of 12v/2A. I purchased the Anker Astro3 10000 mAh charger. But I solved it.ДЇirst - realize your Transformer Prime requires a minimum of 12 volts to charge, and MOST of the external chargers are 5v only. So I've been trying to figure out how to charge my Transformer Prime from an external battery charger when I'm not near AC, but was having a terrible time making it work.