Do 14-15v Sealed Acid Batteries Exist?

[matt304]

I am in desperate need of a 13.8-15v sealed acid battery to power a video receiver. Do these exist? A 12v doesn't seem to be powering it correctly.

If I could hook some form of very small regulator to a 12v battery to get the voltage that would be OK as well. The power consumption is around 500mA.

Thanks!

 

[AlexGT]

RadioShack sells an adjustable DC adapter Cat no 273-1827A it was on sale for @ $5.99 a few months back

Input voltage from 11-16V (Your SLA) output variable from 12-27V and 3.75A max uses a 12v car plug

Here are the pics:





Here is the manual
http://www.radioshack.com/graphics/uc/rsk/Support/ProductManuals/2731827_PM_EN.pdf

HTH
AlexGT

 

[matt304]

Great, thanks!

 

[gadget_lover]

Your typical car battery is really 13.8 volts when fully charged. While charging it will show closer to 15 volts. That may be why you see 13.8 to 15 volts on the unit.

The '12 volts' name comes from the nominal 2 (rounded down) volts per cell. There are 6 cells.

You should not need the adapter if the battery is properly charged and the polarity is correct.

Daniel

 

[Diesel_Bomber]

There are also 16 volt race car batteries available from many suppliers. The idea is that when a race car is running the ignition and cooling fans and electric fuel pumps and whatnot else without an alternator, a 16 volt battery will voltage-sag into the optimum voltage range of the equipment it's powering, instead of sagging below as a typical 12 volt battery would. An example is here, others can be found at Jegs and Summit. These aren't standard equipment so the cost is pretty high.

:buddies:

 

[HarryN]

Wow - those are serious batteries. From the general description, they seem to be similar to the A123 cells. Even available for standard car replacement applications - for a grand.

I guess that is not really so bad when you think about the $s / capability compared to some flashlight and R/C packs I have seen.

 

[broadgage]

It would be posible to manufacture a sealed acid battery of 14 volts nominal, it would contain 7 cells instead of the 6 used for a 12 volt battery.
I am not aware of any such product however.

I have seen both ni/cd and nimih batteries in 14.4 volt nominal, they contain 12 cells each 1.2 volts nominal.
Perhaps your equipment was intended to use one of those?

 

[gadget_lover]

I am in desperate need of a 13.8-15v sealed acid battery to power a video receiver. Do these exist? A 12v doesn't seem to be powering it correctly.

If I could hook some form of very small regulator to a 12v battery to get the voltage that would be OK as well. The power consumption is around 500mA.

Thanks!

It occurred to me that the video reciever may list 13.8 to 15 volts to cover the use of a nicad or nimh battery pack.

Just thought I'd mention it.

Daniel

 

[HarryN]

Hi Daniel :wave:

Your point about using NiCd or NiMH packs is a good one - that was probably the intention - especially for a 500ma draw.

I just had to come back to this thread and give a plug for the guys at VoltPhreaks. (link from diesel_bomber above) Those are just amazing batteries. http://www.voltphreaks.com/index.php

That link alone is worth a place in the battery section.

 

[BVH]

At one time, I was searching for the same thing to run my Locators, an SLA in the nominal 14 Volt range. I actually found a 7-cell SLAs contained in a 28 Volt aircraft turbine engine starting package. It used two ea., 7 cell SLA's but was fairly expensive. It was in a great little self contained case with cables and charger - the whole enchilada.
Here ya go, read all about 24 and 28 Volt start-pacs.

http://www "dot" startpac.com/tutorial.php

 

[matt304]

Hi guys,

Sorry I didn't stop back in sooner, was delayed by a few things.

I finally sat down tonight to order the RadioShack adjustable DC adapter. Only one problem, I can't find it. Does anyone know the link to it?

Thanks

P.S.

This is to power a 915mhz video receiver. It's odd, because both receiver and transmitter are made by the same company and have different voltage requirements. The TX lists 12-13.5v and the RX lists 13.8-15V. (Recalling the numbers off the top of my head, may be slightly different.) Not sure why they have different voltages, but I cannot get them to operate correctly running the RX from a 12V battery. Signal is very distorted, and it doesn't seem to be related to the frequency chip or the antenna.

Now, these batteries I have are smaller, 5AH, and the charged voltage is only 12.5V.