Topic: sla for laptop and ua5?

[BJ]

ok..let me start by saying, This math, isn't that hard, but understanding all the different terms(for a newbie) is extremely difficult, as I am not into electrics at all!  I am wondering what it would take(if possible) to run a sla to power my laptop (14.8V, 3200mAH) and my ua5 (500mAH) with the same sla in the field, and have several hours.  Is this possible with the different voltages?  I am not looking to spend lots of money either, thats why I have not purchased a laptop pack.  They are just too expensive.  I do not go to record that often, and only in local clubs when i do(some have power some dont). I was looking at rat shack, and saw they had some 12V 7000mAH sla's for less than $30.  Would this work?  Sorry to be such a newb.

[BCostigan]

I don't think an sla is the route you want to take.  They don't make a 14.8v sla due to cell voltage proerties.

I do think you could make a 15volt D sled to power the laptop though.  It would consist of  10 "D" batteries connected in series.

Using these rechargeables:

http://shop.mahaenergy.com/store/viewItem.asp?idProduct=5

you would have enough power to run for about 2 hours (7500 mAh)

But at  almost $28 for 2 of these you're better off dropping the extra coin for the batteries made for laptops.


The 12 volt sla you mentioned would work great for the ua-5 by itself.

[sexymexi]

is it safe to run a ua-5 off 12 volts?  i mean the batts for mine say 9.6v, but they charge at 12 v, and at a full charge with my multimeter, they say like 11.7 v's.  if this is the case, then i might have to run my deck, and ua-5 off my sla. no need for other batt's.

[BCostigan]

yes...running a ua-5 off a 12 volt sla if fine.   That's what Oade uses for their ua-5 battery packs....12 volt slas.

The ua-5 also runs just fine off 9.6 volts which is why many people run them off the lighter RC battery packs.

[nic]

I could be very wrong as I've never tried this(nor am I a electrician), but couldnt you wire 2 SLA(say a 12v and a 6v) in series to sum the voltages, creating a 18v pack, or would you need to put a regulator in there?
most laptops require 15-19v

[leegeddy]

I could be very wrong as I've never tried this(nor am I a electrician), but couldnt you wire 2 SLA(say a 12v and a 6v) in series to sum the voltages, creating a 18v pack, or would you need to put a regulator in there?
most laptops require 15-19v

do not sum up different voltages!!!!!  the 12V will begin to charge the 6V and you would not like the results.

marc

[nic]

I could be very wrong as I've never tried this(nor am I a electrician), but couldnt you wire 2 SLA(say a 12v and a 6v) in series to sum the voltages, creating a 18v pack, or would you need to put a regulator in there?
most laptops require 15-19v

do not sum up different voltages!!!!!  the 12V will begin to charge the 6V and you would not like the results.

marc

ah, thanks...like I said above, "I could be very wrong . . . nor am I a electrician"

[BCostigan]

but you can connect 3 like 6volt batteries in series to get 18volts.  


I didn't suggest this because I don't know how fickle laptops are on power.  

If the person is willing to carry around 3 SLAs and the laptop will take 18 volts it'll work....oh yea...and then carry a 12 volt for the ua-5.