Charging a phone from a 12V SLA battery

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timmmay

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# 175118 18-Jun-2015 05:59

This bit has been answered
Does anyone know of a commercial product that will let you charge a phone from a 12V SLA battery? Ideally i'd like a commercial product, not a DIY solution. The reason is I'll probably end up with a fairly large 12V SLA battery as a DC UPS for my ONT/router (20 - 30AH I guess) which in a disaster would easily have enough power to charge my phone as well.

I could use a car cigarette lighter charger in a pinch, with enough alligator clips, but it's not ideal. There is this, but I'd have to mess with it a bit. This looks better but doesn't ship to NZ.

NEW QUESTION: the original question has been answered. See the new question near bottom of p3 - how do I charge an SLA battery using a solar panel with 5V output.

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# 1326973 18-Jun-2015 08:01

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I'd be going the cigarette lighter route. It's a standard connection that wont change in spec anytime soon.

If you go for a usb supply you're stuck if something comes along with a different power requirement. Also, if the usb module craps out, you're stuck, where a cigarette lighter you throw the stuffed one away and grab another.

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timmmay

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# 1326977 18-Jun-2015 08:07

The problem with a cigarette lighting is connecting the battery terminals to the strangely shaped terminals.

andrewNZ

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# 1326981 18-Jun-2015 08:12

? spade terminals ?

http://www.jaycar.co.nz/Wire%2C-Cable-%26-Accessories/Cable-Accessories/Quick-Connect-Terminals/Piggy-Back-Female-Spade---Red---Pk-8/p/PT4510

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andrewNZ

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# 1326983 18-Jun-2015 08:16

my mistake, i suspect you mean the lighter not the battery.

http://www.jaycar.co.nz/Interconnect/Plugs%2C-Sockets-%26-Adaptors/Automotive/15A-Cigarette-Socket-to-8mm-Eye-Terminal/p/PT4451

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raytaylor

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# 1326985 18-Jun-2015 08:19

I am pretty sure the jump chargers that you can get for cars now have usb as standard on them.

Also I think jaycar sells a battery box, with a cigarette lighter socket on it and built in wiring.

Ray Taylor
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timmmay

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# 1326994 18-Jun-2015 08:27

Those could do the job thanks Andrew :)

Ray - unsure what you mean about battery box. The car jump starters could do the job, but since I already have a big battery I figured something small that takes 12V and gives a USB socket would be ideal.

I think this product may be perfect.

Jase2985

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# 1326995 18-Jun-2015 08:27

timmmay: The problem with a cigarette lighting is connecting the battery terminals to the strangely shaped terminals.

cut them off and crimp on a suitable terminal that works?

Jase2985

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# 1326999 18-Jun-2015 08:30

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THis is what ray is meaning

timmmay

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# 1327001 18-Jun-2015 08:32

Jase2985:
timmmay: The problem with a cigarette lighting is connecting the battery terminals to the strangely shaped terminals.

cut them off and crimp on a suitable terminal that works?

Cut what off? Connecting one of these to an SLA battery would be a pain.

timmmay

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# 1327003 18-Jun-2015 08:32

Jase2985:
THis is what ray is meaning

Interesting. I don't need a box, may just use the $10 thingy from Amazon.

Adamww

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# 1327014 18-Jun-2015 08:52

Search "12v usb module" on ebay.com and you will find many similar to what you have linked to on amazon but for about half the price. For instance: http://www.ebay.com/itm/DC-DC-buck-Converter-Module-8-22V-9V-12V-to-5V-double-usb-output-1M-power-cable-/221508615380?pt=LH_DefaultDomain_0&hash=item3392f13cd4

timmmay

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# 1327016 18-Jun-2015 08:58

Adamww: Search "12v usb module" on ebay.com and you will find many similar to what you have linked to on amazon but for about half the price. For instance: http://www.ebay.com/itm/DC-DC-buck-Converter-Module-8-22V-9V-12V-to-5V-double-usb-output-1M-power-cable-/221508615380?pt=LH_DefaultDomain_0&hash=item3392f13cd4

Interesting, thanks. That particular listing is so poorly written I have no idea what they're talking about. This one seems better, but could be difficult to get one that will charge a phone at full rate.

andrewNZ

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# 1327027 18-Jun-2015 09:08

I'd be VERY wary of something that cheap.

Isn't this something that might be very important one day? When was the last time you heard of cheap crap lasting the distance? Would you recommend someone get a $10 HDD as an emergency backup?

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timmmay

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# 1327032 18-Jun-2015 09:11

andrewNZ: I'd be VERY wary of something that cheap.

Isn't this something that might be very important one day? When was the last time you heard of cheap crap lasting the distance? Would you recommend someone get a $10 HDD as an emergency backup?

Yes, it is. I would tend towards something on Amazon, though it's probably made in the same factory to the same standards. If I can find something higher quality I'd buy it.

jimbob79

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# 1327038 18-Jun-2015 09:16

I've actually gotten this one from eBay.

http://www.ebay.com/itm/131352888687?_trksid=p2057872.m2749.l2649&ssPageName=STRK%3AMEBIDX%3AIT

However it states that it's 3 amps when in fact it's more likely 1.1~1.2 amps per USB port. So if you are charging up and iPad is will charge, but it will take about 12 hours rather than the 6~7 hours.

I actually have it stuck to the back side of my headboard of my bed. I'm then able to charge my iPad & iPhone at the same time and I'm not restricted due to the OEM 1.2m USB cable length. Also the unit does not get hot, in fact I can't detect any heat. All the electronics are encased in liquid filling/potting which I guess makes it sort of waterproof*. *Don't quote me on that, I could be wrong.

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