Fauzan Posted March 23, 2014 Report Share Posted March 23, 2014 Hi all respective mixers and JWSound members that might be reading. I have a Zaxcom stereo wireless receiver I am thinking of making an external battery pack for it. The maximum voltage input for it is rated at 15V. If I were to get a 10AA battery holder (15V out) to power the receiver as external power and knowing rechargeable battery circuitry - will there be a risk of overloading? I am asking because I have blown a Surefire flashlight bulb before using rechargeable battery (perhaps it was overcharged? It was a CR123A rechargeable system). Would I be better off with a 8AA battery holder? So even if it is overcharged when fresh coming out of the chargers, it won't exceed the maximum voltage in. By the way, making this external power since the 4AA internal batteries will only last about 3 hours. Hoping to get longer runtime so I only need to change the battery around lunch time, same as my other systems. I am using Sanyo Eneloop XX 2500 mAh with Maha Powerex 8AA charger. Please advice, and thanks in advance! Good day. Best regards, Fauzan. Sent from my iPad using Tapatalk Quote Link to comment Share on other sites More sharing options...
berniebeaudry Posted March 23, 2014 Report Share Posted March 23, 2014 Rechargeable batteries are usually only 1.2 volts so you actually will be at 12 volts, not 15. So you're safe there. Is this for a camera link? If so why not get power from the camera/camera battery? If you do a search you'll find a discussion about external powering for camera links. Another method mentioned there is a rechargeable Lithium Ion battery pack. Get one with the circuitry that prevents overcharging. Quote Link to comment Share on other sites More sharing options...
Fauzan Posted March 23, 2014 Author Report Share Posted March 23, 2014 Hey Bernie thanks for the reply! Yes I am preparing the external powering cable as well... Just making my own battery pack for cameras that does not have hirose or dtap system output... Or when the camera don't let you tap their power... Interesting to read that 1.5V rated are around 1.2V... Now I remember I have a multimeter at home. Will check it out when I get home. Sent from my C6502 using Tapatalk Quote Link to comment Share on other sites More sharing options...
Marc Wielage Posted March 23, 2014 Report Share Posted March 23, 2014 I use these $30 6800mA rechargeable battery packs off eBay, which typically run about 12 hours powering a (very similar) Lectro SRb wireless receiver: I typically get 18-24 months use out of them before they eventually swell up and go bad, but I think that's not bad. The alternative would be an L-battery that would cost three or four times as much (but would be more reliable). http://www.ebay.com/sch/i.html?_trksid=p2047675.m570.l1313.TR0.TRC0.H0.X6800ma+Lithium+battery&_nkw=6800ma+Lithium+battery&_sacat=0&_from=R40 Quote Link to comment Share on other sites More sharing options...
Fauzan Posted March 23, 2014 Author Report Share Posted March 23, 2014 Thanks Marc, would look into that but wondering what made it swell? Heat? Edit: oh sorry I thought it was an AA battery holder. Yeah now I know what you mean by swelling. Quote Link to comment Share on other sites More sharing options...
Rick Reineke Posted March 23, 2014 Report Share Posted March 23, 2014 I use what appear to be the same as Marc. (China made)12V rechargeable Li-po battery. 6800mAh. ( about 80 watt hours) http://www.ebay.com/itm/180794710718?ssPageName=STRK:MEWAX:IT&_trksid=p3984.m1423.l2649 I have four I've been using for about a year and show no signs of swelling... yet. Unfortunately they take about 14+ hours to fully re-charge from a 'dead' state, but less than 8 hr.s, if I change em at lunch.. no memory effect though. It has a non-locking 5.5 ~ 2.1mm coax power connector but it fits snug and has not been a problem... a right-angle connector and a little gaffer tape is good insurance though. They allegedly can't be over-charged and auto shut-down @ 10 volts or thereabouts. Also available is a 9.8 mA/hr version, though it's naturally a little larger and heavier. - 6800mAh 12V / battery: - Dimension: 9.2cm X 6.0cm X 3.0cm - Weight: about 454 grams) - 9800mAh 12V / battery: - Dimension: 12.1cm X 8.2cm X 3.4 cm - Weight: about 800 grams) Quote Link to comment Share on other sites More sharing options...
studiomprd Posted March 23, 2014 Report Share Posted March 23, 2014 Fauzan: " Interesting to read that 1.5V rated are around 1.2V... " that is the sort of basic knowledge needed to begin these projects... all NiMH rechargeable batteries, including the ones you mention, are labeled as being 1.2 v... there is some other important basic information starting with Ohm's law) you need to find and absorb as well, for DIY battery projects, particularly about NiMH batteries good luck... Quote Link to comment Share on other sites More sharing options...
Fauzan Posted March 24, 2014 Author Report Share Posted March 24, 2014 Studiomprd: thank you sir! Sent from my iPad using Tapatalk Quote Link to comment Share on other sites More sharing options...
Fauzan Posted March 24, 2014 Author Report Share Posted March 24, 2014 Also thanks for the reply Rick and the mini review of the lipo batts. Something to keep in mind in future. Sent from my iPad using Tapatalk Quote Link to comment Share on other sites More sharing options...
Travis Williamson Posted May 12, 2014 Report Share Posted May 12, 2014 Just wanted to say thanks to Marc for this post. I've been looking for a quick, cheap, temporary solution for powering a couple of UCR211's until I can afford a proper distro box and run everything including the 664 off an NP1. I came across a few batteries just like this in my research travels. I'm still learning about electonics and how to power things, so it's reassuring to hear someone else is doing it. Travis I use these $30 6800mA rechargeable battery packs off eBay, which typically run about 12 hours powering a (very similar) Lectro SRb wireless receiver: I typically get 18-24 months use out of them before they eventually swell up and go bad, but I think that's not bad. The alternative would be an L-battery that would cost three or four times as much (but would be more reliable). http://www.ebay.com/sch/i.html?_trksid=p2047675.m570.l1313.TR0.TRC0.H0.X6800ma+Lithium+battery&_nkw=6800ma+Lithium+battery&_sacat=0&_from=R40 Quote Link to comment Share on other sites More sharing options...
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