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Author Topic: 12v SLA charging question  (Read 7537 times)

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Offline Chuck

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12v SLA charging question
« on: September 07, 2011, 06:46:06 PM »
I need to charge a 12v SLA battery

Specifications:
Chemistry   Lead Acid
Voltage   12.0 V
Capacity   5 Ah
Rating   60 Whr
Cell   6 cells

Is there any reason I can't just use a 12v DC wall-wart to charge it?
I know I shouldn't leave it charging more than say 24 hours...

I'm trying to get a 12v power source on the cheap.
Reality is merely an illusion, albeit a very persistent one.

Microphones: AKG C 480 B comb-ULS/ CK 61/ CK 63, Sennheiser MKE 2 elements, CAD GXL1200 (cardioid and mod-cardioid capsule & electronics mod), Audix M1290-o, Micro capsule active cables w/ Naiant PFA's, Naiant MSH-1O, Naiant AKG Active cables, Church CA-11 (cardioid), (1) Nady SCM-1000 (mod)
Pre-amps: Naiant littlebox, Naiant littlekit v2.0, BM2p+ Edirol UA-5, Church STC-9000
Recorders: Sound Devices MixPre-6, iRiver iHP-120 (Rockboxed & RTC mod)

Recordings on the LMA: http://www.archive.org/bookmarks/ChuckM
Recording website & blog: http://www.timebetweenthenotes.com

Offline hi and lo

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Re: 12v SLA charging question
« Reply #1 on: September 07, 2011, 07:49:27 PM »
I think the charging voltage needs to be slightly higher than 12v. More like 13.5v, but I reserve the right to be an idiot.

I probably wouldn't recommend a charger that isn't intelligent. it should at minimum have overcharge protection.

Offline H₂O

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Re: 12v SLA charging question
« Reply #2 on: September 07, 2011, 10:04:48 PM »
You cannot just use a 12v wallwart to charge an sla as the is nothing to stop the charging and nothing to tell you when the battery is charged. 

You may want to try buying a setup at battery space as you can get unregulated liOn packs rated at 11.1v with charger for around $50

Ask in the ys for a 12v sla charger if $50 is too much
« Last Edit: September 07, 2011, 10:06:26 PM by H²O »
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kirk97132

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Re: 12v SLA charging question
« Reply #3 on: September 08, 2011, 02:16:24 PM »
the cool thing about SLA batteries is that they are all the same...not literally but as for chargers.  I have a charger for car batteries that will do two low amperage setting and one high.  Well actually I have a bubba bad charger that I used in my repair shop but we don't need something that puts out 60 amps.....back on topic. you can use the lower settings to charge a SAL battery and if it has a trickle setting it can stay connected and will keep it charged.  DOWNSIDE...the charger will have two large alligator type clips and not be set up to a 4pin if it is something like the eco charges.  but if you have just the bayonet slide on connectors you can clip it on and you're all set.  Can be found pretty reasonable of you shop around

Offline Chuck

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Re: 12v SLA charging question
« Reply #4 on: September 08, 2011, 02:24:20 PM »
I make my own wires and cables. I abandoned the 4 pin XLR's connectors for battery power a while ago. They are just too bulky and overkill for my needs.
I'll probably hit the local electronics surplus warehouse for a proper 12v charger then. Batteries Plus sells one that'll work for $21, but, as I said, I'm doing this on the cheap.
Reality is merely an illusion, albeit a very persistent one.

Microphones: AKG C 480 B comb-ULS/ CK 61/ CK 63, Sennheiser MKE 2 elements, CAD GXL1200 (cardioid and mod-cardioid capsule & electronics mod), Audix M1290-o, Micro capsule active cables w/ Naiant PFA's, Naiant MSH-1O, Naiant AKG Active cables, Church CA-11 (cardioid), (1) Nady SCM-1000 (mod)
Pre-amps: Naiant littlebox, Naiant littlekit v2.0, BM2p+ Edirol UA-5, Church STC-9000
Recorders: Sound Devices MixPre-6, iRiver iHP-120 (Rockboxed & RTC mod)

Recordings on the LMA: http://www.archive.org/bookmarks/ChuckM
Recording website & blog: http://www.timebetweenthenotes.com

Offline DigiGal

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Re: 12v SLA charging question
« Reply #5 on: September 08, 2011, 02:26:50 PM »
There are several circuits available, here are a couple so you could build your own charger...

http://www.circuitstoday.com/lead-acid-battery-charger





http://alectronics.blogspot.com/2010/09/12v-battery-charger-for-sealed-lead.html

« Last Edit: September 08, 2011, 02:31:58 PM by DigiGal »
Mics: AKG CK91/CK94/CK98/SE300 D-330BT | DPA 4060 4061 4266 | Neumann TLM 103 | Senn ME66/K6/K6RD MKE2 MD421 MD431 | Shure VP88 SM7B SM63L SM58 Anniversary Cables: Gotham GAC-4/1 Quad w/Neutrik EMC | Gotham GAC-2pair w/AKG MK90/3 connectors | DigiGal AES>S/PDIF cable Preamp: SD MixPre-D Recorders: SD MixPre 6 | Marantz PMD 661 Edit: 2011 27" 3.4GHz Quad i7 iMac High Sierra | 2020 13" MBA Quad i7 Catalina | Wave Editor | xACT | Transmission | FCP X 

Offline Chuck

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Re: 12v SLA charging question
« Reply #6 on: September 08, 2011, 02:48:52 PM »
Hmmm... that's a good idea!
Reality is merely an illusion, albeit a very persistent one.

Microphones: AKG C 480 B comb-ULS/ CK 61/ CK 63, Sennheiser MKE 2 elements, CAD GXL1200 (cardioid and mod-cardioid capsule & electronics mod), Audix M1290-o, Micro capsule active cables w/ Naiant PFA's, Naiant MSH-1O, Naiant AKG Active cables, Church CA-11 (cardioid), (1) Nady SCM-1000 (mod)
Pre-amps: Naiant littlebox, Naiant littlekit v2.0, BM2p+ Edirol UA-5, Church STC-9000
Recorders: Sound Devices MixPre-6, iRiver iHP-120 (Rockboxed & RTC mod)

Recordings on the LMA: http://www.archive.org/bookmarks/ChuckM
Recording website & blog: http://www.timebetweenthenotes.com

Offline DigiGal

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Re: 12v SLA charging question
« Reply #7 on: September 08, 2011, 03:21:10 PM »
In the mid 90's I built the one on page 70 fig 13-2 from Encyclopedia of Electronic Circuits Vol 4.  It made an awesome charger for SLA's.  Attached here is a PDF of that circuit.



« Last Edit: September 08, 2011, 03:28:07 PM by DigiGal »
Mics: AKG CK91/CK94/CK98/SE300 D-330BT | DPA 4060 4061 4266 | Neumann TLM 103 | Senn ME66/K6/K6RD MKE2 MD421 MD431 | Shure VP88 SM7B SM63L SM58 Anniversary Cables: Gotham GAC-4/1 Quad w/Neutrik EMC | Gotham GAC-2pair w/AKG MK90/3 connectors | DigiGal AES>S/PDIF cable Preamp: SD MixPre-D Recorders: SD MixPre 6 | Marantz PMD 661 Edit: 2011 27" 3.4GHz Quad i7 iMac High Sierra | 2020 13" MBA Quad i7 Catalina | Wave Editor | xACT | Transmission | FCP X 

Offline H₂O

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Re: 12v SLA charging question
« Reply #8 on: September 08, 2011, 03:29:13 PM »
http://www.ebay.com/sch/i.html?_from=R40&_trksid=p5197.m570.l1313&_nkw=battery+tender+12V+charger&_sacat=See-All-Categories

I used Battery Tender chargers back in the day and you can get the Jr version for about $20.
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Offline Chuck

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Re: 12v SLA charging question
« Reply #9 on: September 08, 2011, 03:31:30 PM »
In the mid 90's I built the one on page 70 fig 13-2 from Encyclopedia of Electronic Circuits Vol 4.  It made an awesome charger for SLA's.  Attached here is a PDF of that circuit.

Yeah, I probably have most of the parts already.
If I can't find a cheap one I may just build my own.

Though, I have started to value my time more lately. Putting hours into doing something like this the right way will take some time.

Thanks for the circuits!
Reality is merely an illusion, albeit a very persistent one.

Microphones: AKG C 480 B comb-ULS/ CK 61/ CK 63, Sennheiser MKE 2 elements, CAD GXL1200 (cardioid and mod-cardioid capsule & electronics mod), Audix M1290-o, Micro capsule active cables w/ Naiant PFA's, Naiant MSH-1O, Naiant AKG Active cables, Church CA-11 (cardioid), (1) Nady SCM-1000 (mod)
Pre-amps: Naiant littlebox, Naiant littlekit v2.0, BM2p+ Edirol UA-5, Church STC-9000
Recorders: Sound Devices MixPre-6, iRiver iHP-120 (Rockboxed & RTC mod)

Recordings on the LMA: http://www.archive.org/bookmarks/ChuckM
Recording website & blog: http://www.timebetweenthenotes.com

Offline Chuck

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Re: 12v SLA charging question
« Reply #10 on: September 10, 2011, 10:57:32 AM »
Man, I'm really rethinking the SLA thing again...
Even the relatively small 5 amp 12v SLA I have is so friggin' heavy.

There are tons of relatively cheap 12v Li-ion's (Hong Kong) on eBay, but I haven't read anything good about them here.

Reality is merely an illusion, albeit a very persistent one.

Microphones: AKG C 480 B comb-ULS/ CK 61/ CK 63, Sennheiser MKE 2 elements, CAD GXL1200 (cardioid and mod-cardioid capsule & electronics mod), Audix M1290-o, Micro capsule active cables w/ Naiant PFA's, Naiant MSH-1O, Naiant AKG Active cables, Church CA-11 (cardioid), (1) Nady SCM-1000 (mod)
Pre-amps: Naiant littlebox, Naiant littlekit v2.0, BM2p+ Edirol UA-5, Church STC-9000
Recorders: Sound Devices MixPre-6, iRiver iHP-120 (Rockboxed & RTC mod)

Recordings on the LMA: http://www.archive.org/bookmarks/ChuckM
Recording website & blog: http://www.timebetweenthenotes.com

Offline DigiGal

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Re: 12v SLA charging question
« Reply #11 on: September 10, 2011, 01:37:42 PM »
QFT

Even the relatively small 5 amp 12v SLA I have is so friggin' heavy.
Mics: AKG CK91/CK94/CK98/SE300 D-330BT | DPA 4060 4061 4266 | Neumann TLM 103 | Senn ME66/K6/K6RD MKE2 MD421 MD431 | Shure VP88 SM7B SM63L SM58 Anniversary Cables: Gotham GAC-4/1 Quad w/Neutrik EMC | Gotham GAC-2pair w/AKG MK90/3 connectors | DigiGal AES>S/PDIF cable Preamp: SD MixPre-D Recorders: SD MixPre 6 | Marantz PMD 661 Edit: 2011 27" 3.4GHz Quad i7 iMac High Sierra | 2020 13" MBA Quad i7 Catalina | Wave Editor | xACT | Transmission | FCP X 

Offline Chuck

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Re: 12v SLA charging question
« Reply #12 on: September 10, 2011, 01:52:38 PM »
I found what I needed today at Harbour Freight Tools for $9.99.
Reality is merely an illusion, albeit a very persistent one.

Microphones: AKG C 480 B comb-ULS/ CK 61/ CK 63, Sennheiser MKE 2 elements, CAD GXL1200 (cardioid and mod-cardioid capsule & electronics mod), Audix M1290-o, Micro capsule active cables w/ Naiant PFA's, Naiant MSH-1O, Naiant AKG Active cables, Church CA-11 (cardioid), (1) Nady SCM-1000 (mod)
Pre-amps: Naiant littlebox, Naiant littlekit v2.0, BM2p+ Edirol UA-5, Church STC-9000
Recorders: Sound Devices MixPre-6, iRiver iHP-120 (Rockboxed & RTC mod)

Recordings on the LMA: http://www.archive.org/bookmarks/ChuckM
Recording website & blog: http://www.timebetweenthenotes.com

Offline DigiGal

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Re: 12v SLA charging question
« Reply #13 on: September 10, 2011, 01:54:58 PM »
Mics: AKG CK91/CK94/CK98/SE300 D-330BT | DPA 4060 4061 4266 | Neumann TLM 103 | Senn ME66/K6/K6RD MKE2 MD421 MD431 | Shure VP88 SM7B SM63L SM58 Anniversary Cables: Gotham GAC-4/1 Quad w/Neutrik EMC | Gotham GAC-2pair w/AKG MK90/3 connectors | DigiGal AES>S/PDIF cable Preamp: SD MixPre-D Recorders: SD MixPre 6 | Marantz PMD 661 Edit: 2011 27" 3.4GHz Quad i7 iMac High Sierra | 2020 13" MBA Quad i7 Catalina | Wave Editor | xACT | Transmission | FCP X 

Offline Chuck

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Re: 12v SLA charging question
« Reply #14 on: September 10, 2011, 03:14:48 PM »
Yeah, that's it. It was on sale for $9.99. I just got finished soldering some connectors on it.
Reality is merely an illusion, albeit a very persistent one.

Microphones: AKG C 480 B comb-ULS/ CK 61/ CK 63, Sennheiser MKE 2 elements, CAD GXL1200 (cardioid and mod-cardioid capsule & electronics mod), Audix M1290-o, Micro capsule active cables w/ Naiant PFA's, Naiant MSH-1O, Naiant AKG Active cables, Church CA-11 (cardioid), (1) Nady SCM-1000 (mod)
Pre-amps: Naiant littlebox, Naiant littlekit v2.0, BM2p+ Edirol UA-5, Church STC-9000
Recorders: Sound Devices MixPre-6, iRiver iHP-120 (Rockboxed & RTC mod)

Recordings on the LMA: http://www.archive.org/bookmarks/ChuckM
Recording website & blog: http://www.timebetweenthenotes.com

Offline DigiGal

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Re: 12v SLA charging question
« Reply #15 on: September 10, 2011, 03:21:57 PM »
Just a thought, I used to fuse the output of SLA's back when I used to use them.
Mics: AKG CK91/CK94/CK98/SE300 D-330BT | DPA 4060 4061 4266 | Neumann TLM 103 | Senn ME66/K6/K6RD MKE2 MD421 MD431 | Shure VP88 SM7B SM63L SM58 Anniversary Cables: Gotham GAC-4/1 Quad w/Neutrik EMC | Gotham GAC-2pair w/AKG MK90/3 connectors | DigiGal AES>S/PDIF cable Preamp: SD MixPre-D Recorders: SD MixPre 6 | Marantz PMD 661 Edit: 2011 27" 3.4GHz Quad i7 iMac High Sierra | 2020 13" MBA Quad i7 Catalina | Wave Editor | xACT | Transmission | FCP X 

kirk97132

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Re: 12v SLA charging question
« Reply #16 on: September 11, 2011, 12:59:18 PM »
Man, I'm really rethinking the SLA thing again...
Even the relatively small 5 amp 12v SLA I have is so friggin' heavy.

There are tons of relatively cheap 12v Li-ion's (Hong Kong) on eBay, but I haven't read anything good about them here.
I have one and cannot say there are any issues with the power it supplies.  The draw backs are no metering and an easy to hit on/off switch.  I have a buddy who has posted "noise" from them but it is below the self noise of mics....

 

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