What voltage?

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  • #35205
    dwynnehughdwynnehugh
    Participant
      @dwynnehugh
      Forumite Points: 0

      Does anyone know if using an in-car charger, for a sat nav or mobile phone, when utilising the cigarette lighter socket what is the output voltage into the mobile/sat nav unit? I have recently purchased a Garmin sat nav – very good but the battery only lasts 1hr!!! Garmin say that their in-car chargers are designed to ‘just’ keep the unit going and not designed to charge the internal battery. I’ve had 3 models of Garmin and they all last about 1hr before they need a charge even if connected to the car charging system.

      To overcome this I purchased a Duracell battery bank (6700mAh) model and connected that to the in car charger socket and then the output of the bank to the sat nav.  I’m now not 100% certain that the battery bank is operating correctly.

      Any ideas – does the plug in gizmo to the cigarette lighter also have some circuitry to reduce the output voltage to normal USB levels?

      The more you meet people the more you understand why Noah took animals instead of humans

      #35207
      Dave RiceDave Rice
      Participant
        @ricedg
        Forumite Points: 7

        Cigarette lighters are 12v, USB is 5v.

        #35208
        blacklion1725blacklion1725
        Participant
          @blacklion1725
          Forumite Points: 2

          Pretty sure the cigarette lighter is typically 12V DV and the USB Adapters bring it down to 5V DC. Most standalone Sat Navs (mines a tomtom) are designed to be permanently powered – one hour is quite long (my TomTom is a few minutes without power). Don’t quite follow about the battery bank – is it any better at charging the Garmin?

          #35209
          RichardRichard
          Participant
            @sawboman
            Forumite Points: 16

            Unless there are specific indications on the device relating to its input and out put voltage I would be very careful. A plugs in USB adapter should put out a USB voltage,but following recent, or maybe less than recent developments it may well give out more than the old style 5 volts nominal. Some of the latest USB voltages can be considerably higher than that old figure and are supposed to be negotiated between the devices involved. Without a detailed examination of the devices it is my current practice to assume nothing except unlikely compatibility unless it is proven. It is better to be safe rather than sorry.

            Good luck checking things out.

            #35210
            dwynnehughdwynnehugh
            Participant
              @dwynnehugh
              Forumite Points: 0

              The Garmin was supplied, as all sat navs do, with a cig lighter socket with a  USB connector then a mini USB to the rear of the sat nav, perhaps naively I assumed that this was a 5v supply via the supplied plug. Anyway whatever the output voltage it does not seem to have harmed the sat nav – so I assume that the sat nav is designed for v > 5v when charging.

              The battery specifies an input charging voltage of 5v with a micro input connector and a standard USB plug output – I daisy chained the system – car charger plug – battery bank – sat nav removing the charger input when not in use.

              Seems I may have over ‘voltaged’ the battery bank. Is there a suitable plug whereby you can actually measure the output of the ‘USB’ connector on the car charger to see what it actually is.  I always assumed (that word again!!) that it was 5v by the very nature of the fact there was a USB socket on it!

              The more you meet people the more you understand why Noah took animals instead of humans

              #35212
              Dave RiceDave Rice
              Participant
                @ricedg
                Forumite Points: 7

                If you have something like this then it will be 5v . Don’t worry about what Richard is on about, that’s the fast charging specs and both ends need to be compatible and will negotiate with each other. It’s 5 volts unless they both agree so you won’t have over volted the battery pack via a standard cigarette lighter to USB jobbie.

                The Duracell power bank has such a fast charging socket so even if the Garmin needs more watts it should provide it and it can be charged itself whilst charging devices. So in theory all should be OK. How does it perform on the battery bank alone i.e. no cigarette light charger involved? Does which socket it’s plugged into make a difference?

                #35215
                Bob WilliamsBob Williams
                Participant
                  @bullstuff2
                  Forumite Points: 0

                  I bought this last month:   https://tinyurl.com/y35lcwd3

                  It charges my Xperia L3 phone from the car 12v ciggy lighter socket* via the USB 3 flexy cable connector, but can also charge a USB 2 device, either simultaneously or separately, via the 2.4A socket in the body. It is very small compared to most such chargers I have seen, but it certainly does the job: I have used my Xperia as a satnav with Android Auto, while charging my USB 2 Lenovo tablet, as a test. Due to the 2.4 A output, that takes longer, but the Xperia is charged faster than from a domestic socket. It is left plugged in when used as a Satnav. I have relegated my Garmin Muovo 50 to the back shelf of my parts store: I got much less than an hour from mine Dwynne. I will use the Xperia on Android Auto as my Satnav from now on. I found this to mount it, but not at Amazon:

                  https://tinyurl.com/y5huvmqm

                  It is the best in car phone mount I have ever used, sits in the centre of the dash top out of my road line of sight. I leave it there permanently and it has never moved, does not vibrate. Myself and front passenger can see it clearly and it sits directly over a Cig lighter port below the dash centre. The small plastic lever protruding from the lower front, is the lock/unlock lever. I bought it at TK-Max, on the Clearance shelf: £3.99! I often go there when in Grimsby, there some good bargains to be had.

                  I look on my Garmin now as a device overtaken by technology advances. The batteries are krap! I could use the Garmin with the car mount: it pulls out enough. But why bother?

                  *We ought to have another name for that, now that very few smoke. I know one nicotine addict who will not smoke in his own car, to prevent the smell putting off the next buyer. I won’t let him in my car or house, smoking or not. He stinks of it!

                  When the Thought Police arrive at your door, think -
                  I'm out.

                  #35221
                  dwynnehughdwynnehugh
                  Participant
                    @dwynnehugh
                    Forumite Points: 0

                    OK and many thanks folks.  I would think that the Garmin supplied charger would give out 5v from the 12v car lighter supply (I have not actually been able to put a voltmeter across the output – far too small.

                    My Garmin is a 7″ jobbie, brilliant screen but even Garmion say it will only last on battery about 1 hour, but even when fed off the lighter supply with the Garmin charger it still shows up a ‘battery low’ indicator and then re-sets. When it re-sets the route is lost so you have to enter it again.  I’m very surprised that Garmin seem to think that this is OK – but they do.  The supplied charger does not charge the sat nav but supplies a sufficient trickle current to keep the bl**dy thing on – if you want it to go the whole hog – you have to stop many processes and also screen brightness etc to the very lowest setting – it’ll work but you can’t read the damn thing!!

                    I decided to get the Duracell bank and for many months all was OK, but recently I have noticed that when the daisy chain is set up, the USB plug from the charger gets quite hot, but nowhere else. It does seem that the bank > sat nav  system does extend the sat nav battery life, I’m just wondering if I’ve cooked the battery bank!!  I’ll do a check in the next few days -the small charge indicator lights on the Duracell bank no longer work either.

                    The more you meet people the more you understand why Noah took animals instead of humans

                    #35227
                    RichardRichard
                    Participant
                      @sawboman
                      Forumite Points: 16

                      Dave, I was responding to Tippon’s complaints that his devices were not reacting as he thought they should.

                      I have never used a Garmin so could not comment directly. The 1 hour operational life, with or without the car connection is rubbish and spoke to me of an error somewhere in the system. For Garmin to admit that their car connector is barely able, and in practice is unable to sustain the device let alone charge it on the go suggests a major failure somewhere.

                      The fact that the power bank has now shown signs of failure could be simply down to the fact that they do fail, or could indicate a risk that something, somewhere along the line was not functioning as it should. My understanding is that the source of power should ‘ask’ down stream device what they can accept, this should be fail-safe but if a cheap or otherwise unreliable or faulty device is involved all bets are off. Power leads have been found to be faulty or just too poorly made to function.

                      As a result of Bob’s comments, I can accept that the Garmin is possibly not worth the consideration its name once earned. Certainly, even using the announcer function on a mobile phone to ‘read out navigation instructions’ a travel life of rather more than one hour is achieved by my daughter using her phone tucked into its travel home. I do not think she uses a power adapter to achieve this range. This adds further confirmation to Bob’s view that the Garmin has failed to keep pace with modern needs.

                      However, I am still of the opinion that caution in making, (and breaking) connections between devices is justified.

                      #35230
                      Les.Les.
                      Participant
                        @oldles
                        Forumite Points: 42

                        Hugh, your comment that the USB plug gets hot indicates one of two possibilities.

                        The first is that the plug/socket connection is getting weak, giving a higher resistance at that point, meaning LESS current, but MORE heat dissipation at that connection.

                        The second is that the pack is knackered, so demanding more current.

                        The only way to find out is to cut the lead from the charger, strip wires back, reconnect simply by twisting plus a bit of insulation, then checking voltage is 5v +/- say 0.2v. If OK, untwist one connection, and insert an AMMETER and measure the current. Compare with the specs (if any). Somewhere, it should tell you the consumption of the Garmin, and it needs to be (probably) a bit less than that since as you say it won’t run full brightness without discharging.

                        Next, if all OK, is to solder the connections, then insulate correctly. Messy, but you will get an answer. Is the duracell pack alkaline, or Lithium iron. If the latter, overcharging risks explosion / fire. Alkaline CAN overheat, but in the case of duracell, usually leak first.

                        For the record, I will NEVER buy another Duracell. 30+ years ago, the best. Today, never better than some others, and the number of items destroyed by leaking AA cells is unbelievable. They leak long before their “Best before” date!

                        Les.

                        #35234
                        RichardRichard
                        Participant
                          @sawboman
                          Forumite Points: 16

                          Les, that was an interesting view. A while back I bought a replacement battery for a mobile. It was tagged as Duracel, but to be honest it did not have anything like the life I was expecting. So my view of their products became equally jaundiced. Something about their agents made me suspect that they are now just a badge stamper getting stuff from wherever they can and that quality is not longer a key feature, at least with some of the Duracel badged ‘other devices’ such as mobile power packs and the like.

                          Have you ever seen any of Big Clive’s YouTube videos? He dissects failed devices and jumper packs, battery packs come to explosive end of life in some of his sessions. Build quality is not always what you would hope to see.

                          #35240
                          Wheels-Of-FireWheels-Of-Fire
                          Participant
                            @grahamdearsley
                            Forumite Points: 4

                            Those cigarette lighter adapters often only contain a silicon voltage regulator, these work by increasing their resistance as the voltage rises and that means they get HOT. That sort of setup is only suitable for very low currents so battery charging will be slow or non existent with the device switched on.

                            #35241
                            Wheels-Of-FireWheels-Of-Fire
                            Participant
                              @grahamdearsley
                              Forumite Points: 4

                              How about something like the above ?

                              #35247
                              dwynnehughdwynnehugh
                              Participant
                                @dwynnehugh
                                Forumite Points: 0

                                Thanks to you all, it seems that the chargers supplied with sat navs are possibly not that stable – I will be buying one of those shown on some replies here.

                                Thanks one and all,  Dave.

                                The more you meet people the more you understand why Noah took animals instead of humans

                                #35267
                                Bob WilliamsBob Williams
                                Participant
                                  @bullstuff2
                                  Forumite Points: 0

                                  Dwynne, after rereading your second post: what would worry me about your Garmin is this:

                                  … it still shows up a ‘battery low’ indicator and then re-sets. When it re-sets the route is lost so you have to enter it again.

                                  I haven’t used my Garmin for a few months since setting up the phone as Satnav, but I could switch mine off and it restarts the route from switch off point. If I have travelled any distance from switching off, it recalculates the route. I think there is a problem with your Garmin that is more than just short battery life. Sorry!

                                  When the Thought Police arrive at your door, think -
                                  I'm out.

                                  #35276
                                  dwynnehughdwynnehugh
                                  Participant
                                    @dwynnehugh
                                    Forumite Points: 0

                                    Hi Bob,

                                    Don’t think there is – it’s a Garmin matter.   I started off with Tom Tom and then went to Garmin – I had 2 Garmin jobbies in succession (about £130 odd apiece) and they both did the same exact thing.  Halfords replaced both and eventually they offered an upgrade and I now have a 7″ model, it’s really is v good and beats Tom Tom hands down.

                                    On each Garmin I have had they ALL had the same problem – they shut down after an hour even when attached to the car battery charger system (cig cig lighter with their adaptor and lead) and then it was re-enter details time – this was and still is v bl**dy annoying. Apparently if you shut off the majority of the Garmin features – sound etc. etc. the top us system will just about keep the sat nav charged up during a journey.

                                    I did take this up with Garmin C/Servs and they have told me that the supplied charger is not designed to re-charge the battery (as my Tom Tom did) but merely to top up the sat nav battery. This is why I went to the daisy chain system with a battery pack – at least that did resolve the problem – charger  > bat pack > sat nav.

                                    I might have another chat with Garmin – the last time I found their C/Services pretty lousy whereas Tom Tom was brilliant – I changed to Garmin because the new Tom Toms did not allow you to put in house numbers with the postcodes!! (How bl**dy daft can you get!!)  I remember telling one of their C/S guys that this unit (Tom Tom) was absolutely fantastic – it monitored my heart rate as it shot up simply because their new sat navs had removed this ‘house number’ facility but I would know when I was due a heart attack because of it!! I checked Garmin before I purchased and they did allow house numbers – I think now that Tom Tom may also have re-inserted this OBVIOUS capability / requirement into their current models.

                                    In other words 6 of one and half dozen of the other!!!

                                    The more you meet people the more you understand why Noah took animals instead of humans

                                    #35307
                                    RichardRichard
                                    Participant
                                      @sawboman
                                      Forumite Points: 16

                                      Bob, I wondered about that point; it does sound like a really poor bit of software if it forces some sort of reset every 60 minutes unless the faulty module or modules are not used. It appears only to be reliable when it is used in a stripped down form. I know we should all take regular breaks when driving, but a satellite navigation system that gives up and forces a break to re-build itself every 60 minutes does sound like something that needs a permanent bathroom break and no remission.

                                      It sounds like some sort of fault or error condition arising in one of the modules that misbehaves when the device is run in full fat mode, (even with an external power source).

                                      Is it even a reasonable item to market in its flawed state?

                                      It is far more like an item unfit for sale because it is not of merchantable quality.

                                      #35323
                                      Bob WilliamsBob Williams
                                      Participant
                                        @bullstuff2
                                        Forumite Points: 0

                                        That is what concerned me too Richard. My Garmin Muovo 50 is probably older than Dwynne‘s, but does not completely reset after switch off. It restarts from the point in travel it was formerly at, then swiftly recalculates the route if the car has travelled some distance after restart.

                                        On another (vaguely associated) subject: yesterday I began wondering if I could set my Lenovo 8″ Tab3 to act as a Satnav. Turns out that yes, I can. All I had to do was setup GPS by entering SettingsLocation, tap On and set  Mode to High accuracy. Then I could use Google Maps. Phone has Android 8.0.1 and Android Auto, but the tablet Android is only 6.0 and is not upgradeable, so cannot take A Auto. That is no disadvantage, as Google maps gives a spoken commentary along with clearer maps from the larger screen. The disadvantage is that my dash holder does pull out not wide enough to take the tablet. So it’s back to the drawing board!

                                        The Lenovo would make a really good Satnav if I could only find some way to attach it securely where I can see it. It’s obviously heavier than the phone, so I now have to do some sideways thinking.

                                        That may cause some pain.??

                                        When the Thought Police arrive at your door, think -
                                        I'm out.

                                        #35325
                                        PlaneManPlaneMan
                                        Participant
                                          @planeman
                                          Forumite Points: 196

                                          but the tablet Android is only 6.0 and is not upgradeable, so cannot take A Auto.

                                          Not strictly true Bob. Not officially, maybe.

                                          Have a look here

                                          Not sure why Android Auto won’t run on the tablet as is though, it should install but it’s possibly the lack of a data connection that’s the problem. Try hot-spotting it to your phones data connection then installing it.

                                          If it just won’t install you might like to tr y this to grab the .apk from your phone then email, use a flash drive, whatever to get the .apk on the tablet and install from there, you will have to delve in the settings to enable installation from unknown sources, just switch it off again when your done.

                                          Worth a go.

                                          #35327
                                          Bob WilliamsBob Williams
                                          Participant
                                            @bullstuff2
                                            Forumite Points: 0

                                            Thanks Nolan, I have saved that to Pocket for a look after we return from holiday. I will also set it up on the Hudl (remember you sent, TY) Atm we are engaged in preparing for the trip on Thursday, so not much time. SWMBO is about 60% into Worry Mode about all factors connected with the holiday, will be 100% by Wednesday evening and causing me pain in the ears and brain. I would really like to upgrade both devices, but for now the Lenovo will be fine in Google Maps.

                                            When the Thought Police arrive at your door, think -
                                            I'm out.

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