Battery Supply - UK Vintage Radio Repair and Restoration Discussion Forum

Jack Spark · 24th Dec 2009, 11:39 am

Hello all

Am thinking about building a few things next year, one of them requires a supply of 9V at about 750mA.

I know this is quite high but anyone have any advice as to what batteries to use to make the device portable?
A PP3 will not last long so am wondering if AA or D batteries would be a better option?

Thanks

Jack

YT2095UK · 24th Dec 2009, 11:43 am

6 rechargable `D`s or a 12v SLA with a regulator would do it.

Darren-UK · 24th Dec 2009, 12:03 pm

I've just looked at Maplins SLA's and RLA's and initial cost is a problem. There's a RLA, 12V @ 7Ah which would allow continuous use for around what, 9 hours? but it's hideously expensive. Capacity of SLA's isn't very convenient and I don't know if the rechargeable version would suit your requirements ie portability.

With the required current of 750mA you want to avoid the need to change/recharge lower capacity batteries at frequent intervals.

On balance, perhaps two or even three PP9's in parallel would be a reasonable option if bulkiness, as with the lead-acid's, isn't too much of a problem.

ppppenguin · 24th Dec 2009, 12:13 pm

7Ah SLA from Screwfix. Still a heavy lump but not stupidly expensive.

http://www.screwfix.com/prods/38315/...0-x-65-x-151mm

Sound Man · 25th Dec 2009, 1:58 pm

7Ah SLA from Rapid Electronics. Even cheaper.

http://www.rapidonline.com

glowinganode · 25th Dec 2009, 11:54 pm

I think a rechargeable battery would be best here, a 7Ah sealed lead acid would be ideal though you could go smaller if it's only for intermittant use.
How about a Ni-Cad pack from a remote control car? Not sure of the Ah capacity, but I seem to recall they're 9.6V
Rob.

24th Dec 2009, 11:39 am	#1
Jack Spark Retired Dormant Member Join Date: Aug 2008 Location: London, UK. Posts: 47	Battery Supply Hello all Am thinking about building a few things next year, one of them requires a supply of 9V at about 750mA. I know this is quite high but anyone have any advice as to what batteries to use to make the device portable? A PP3 will not last long so am wondering if AA or D batteries would be a better option? Thanks Jack

24th Dec 2009, 11:43 am	#2
YT2095UK Retired Dormant Member Join Date: Sep 2009 Posts: 487	Re: Battery Supply 6 rechargable `D`s or a 12v SLA with a regulator would do it.

24th Dec 2009, 12:03 pm	#3
Darren-UK Retired Dormant Member Join Date: Apr 2003 Location: Blackpool, Lancashire, UK. Posts: 4,061	Re: Battery Supply I've just looked at Maplins SLA's and RLA's and initial cost is a problem. There's a RLA, 12V @ 7Ah which would allow continuous use for around what, 9 hours? but it's hideously expensive. Capacity of SLA's isn't very convenient and I don't know if the rechargeable version would suit your requirements ie portability. With the required current of 750mA you want to avoid the need to change/recharge lower capacity batteries at frequent intervals. On balance, perhaps two or even three PP9's in parallel would be a reasonable option if bulkiness, as with the lead-acid's, isn't too much of a problem.

24th Dec 2009, 12:13 pm	#4
ppppenguin Retired Dormant Member Join Date: Dec 2003 Location: North London, UK. Posts: 6,168	Re: Battery Supply 7Ah SLA from Screwfix. Still a heavy lump but not stupidly expensive. http://www.screwfix.com/prods/38315/...0-x-65-x-151mm

25th Dec 2009, 1:58 pm	#5
Sound Man Tetrode Join Date: Feb 2009 Location: Long Eaton, Nottinghamshire, UK. Posts: 94	Re: Battery Supply 7Ah SLA from Rapid Electronics. Even cheaper. http://www.rapidonline.com

25th Dec 2009, 11:54 pm	#6
glowinganode Octode Join Date: Apr 2009 Location: Aylesbury, Buckinghamshire, UK. Posts: 1,522	Re: Battery Supply I think a rechargeable battery would be best here, a 7Ah sealed lead acid would be ideal though you could go smaller if it's only for intermittant use. How about a Ni-Cad pack from a remote control car? Not sure of the Ah capacity, but I seem to recall they're 9.6V Rob. __________________ We have done so much, for so long, with so little, we are now qualified to do anything with nothing.