Scott Smith Posted October 31, 2013 Report Share Posted October 31, 2013 Larry: This is very helpful info-I always wondered what the internal rail voltage was regulated to. I assume there must be some voltage drop across the regulator? If so, my guess is that it is probably on the order of a volt or so, meaning that the minimum battery voltage should be about 6.5 volts? Also, does this apply to all transmitters using 9V batteries, or just more recent models? --S Quote Link to comment Share on other sites More sharing options...
afewmoreyears Posted October 31, 2013 Report Share Posted October 31, 2013 Thank you Larry... I will call you... I was having an issue with a transmitter and it was one of the suggestions.. Keep the batteries on the higher side of voltage... especially for longer throws... made sense to me... more juice in the battery, a bit longer throw.. drained battery... well, less throw... Good news to hear the ACTUAL operational information... Twice, thanks again to the Senator as well... Quote Link to comment Share on other sites More sharing options...
LarryF Posted October 31, 2013 Report Share Posted October 31, 2013 Larry: This is very helpful info-I always wondered what the internal rail voltage was regulated to. I assume there must be some voltage drop across the regulator? If so, my guess is that it is probably on the order of a volt or so, meaning that the minimum battery voltage should be about 6.5 volts? Also, does this apply to all transmitters using 9V batteries, or just more recent models? --S Hi Scott, There is no voltage drop across the switching regulator per se. There is a small power loss, usually on the order of 2% to 5%. For instance, with a switcher you can go in at 0.8 to 1.7 Volts and come out at a regulated 3.3 Volts (SM transmitter) or you can go in at 5.5 to 9.6 Volts and come out at a regulated 3.3 Volts (UM400 transmitter). If the voltage coming out is higher than what is going in, then speaking of a voltage drop is meaningless. Since the input voltages are converted and regulated to new voltages, fresh batteries or nearly dead batteries perform the same. The 200 series and older units did not have switchers but used constant bias circuits to stabilize the operation over a wide range of voltages. The output power typically varied about 3 dB from fresh to nearly dead. There were some other brands that varied 10 dB in their radiated power and some manufacturers (not pro) recommended changing the 9 Volt batteries when they got below 8 Volts, which was a real waste of battery resources. Best Regards, Larry Fisher Lectrosonics Quote Link to comment Share on other sites More sharing options...
studiomprd Posted October 31, 2013 Report Share Posted October 31, 2013 " especially for longer throws... " While I know what you mean, I'm not comfortable with that term ... there are a lot of factors that go into range, a lot of physics, and math are quickly involved... Quote Link to comment Share on other sites More sharing options...
VASI Posted November 4, 2013 Report Share Posted November 4, 2013 Seven years have passed. OMG Comment from member ptalsky (Phil): 15 March 2006 An example of this value came up a few months ago when someone posted a new source for batteries. Larry Fisher immediately jumped in to let us know he had ordered some and put them through their testing and provided us with the results. Quote Link to comment Share on other sites More sharing options...
geordi Posted November 7, 2013 Report Share Posted November 7, 2013 Found some new options...http://www.ebay.com/itm/9V-Lithium-Polymer-500mAh-rechargable-battery-with-charger-/251328082102?pt=US_Rechargeable_Batteries&hash=item3a845230b6 and less of a no-name, with amazing capacity (and obvious source) http://www.ebay.com/itm/880mAh-SUPER-4pcs-9v-li-ion-lithium-Rechargeable-9-Volt-Battery-smart-charger/390658547425?_trksid=p2045573.m2042&_trkparms=aid%3D111000%26algo%3DREC.CURRENT%26ao%3D1%26asc%3D27%26meid%3D2525320408163614509%26pid%3D100033%26prg%3D1011%26rk%3D1%26rkt%3D4%26sd%3D390658547425%26 Still more, from Amazon now: http://www.amazon.com/EBL%C2%AE-Self-discharge-Lithium-ion-Rechargeable-Battery/dp/B00EJKIDHE/ref=sr_1_15?ie=UTF8&qid=1383794495&sr=8-15&keywords=9v+lithium+rechargeable+battery http://www.amazon.com/EBL%C2%AE-Lithium-ion-Rechargeable-Battery-Charger/dp/B00EQ3U2AA/ref=sr_1_4?ie=UTF8&qid=1383794495&sr=8-4&keywords=9v+lithium+rechargeable+battery Thoughts from the group? I know everyone is price-conscious, but the benefits of a Li-Po system over Li-ion would seem to be more cycles and less self-discharge while in storage. For high-reuse like on a travelling show, I guess the self discharge would be less of a problem... But what say the group? Has the cheaper price of something like the SoShines or Hitech or the low-rate Tenergy ($5 each at Horizon Battery.com but only 350 mAh) been worth the savings? Have you had to replace them or is it just "They are so cheap, so I just bought more of them and toss the deads"? Quote Link to comment Share on other sites More sharing options...
nevo Posted November 13, 2013 Report Share Posted November 13, 2013 Has anybody tried these maximal power 9Volts http://www.ebay.com/itm/290783329196 US company with 1 year warranty Quote Link to comment Share on other sites More sharing options...
soundtrane Posted November 13, 2013 Report Share Posted November 13, 2013 all look like the same stuff in different wrappers... except the plastic case types... of which there are variants with different prints... Quote Link to comment Share on other sites More sharing options...
studiomprd Posted November 13, 2013 Report Share Posted November 13, 2013 Beach-Tek are also selling a version of them... Quote Link to comment Share on other sites More sharing options...
Cory Kaseman Posted May 12, 2014 Report Share Posted May 12, 2014 So, I bought a set of Soshine 600MAh batteries about a year ago and forgot to review them for you guys. Out of 8 batteries I ordered, 2 were DOA, and 1 only held about 50% charge. The other 5 power my UM400s for about 6:30-6:45, and have done so consistently for as long as I've had them. I like their look and their run time, but their quality control makes me nervous. If only 70% of the batteries you buy even work, then you may as well go with an established brand. Maybe I just have bad luck. Quote Link to comment Share on other sites More sharing options...
chris_bollard Posted June 22, 2014 Report Share Posted June 22, 2014 I would like to get an update on the current state of rechargeable 9 volt batteries for use in UM400 Tx. I'm swapping to all rechargeable batts - I'm happy with my AA solution and before I commit to a 9 volt system I thought if see what my esteemed colleagues have found to be the best; I'm currently leaning towards iPower but thought things may have changed in the last 12 months. Quote Link to comment Share on other sites More sharing options...
Jon Gilbert Posted June 22, 2014 Author Report Share Posted June 22, 2014 I still use iPower and see no reason to change. They're reliable, that's what counts more than higher capacity or lower price. Quote Link to comment Share on other sites More sharing options...
Johnny Karlsson Posted June 22, 2014 Report Share Posted June 22, 2014 +1 for what Jon said. Quote Link to comment Share on other sites More sharing options...
nevo Posted June 22, 2014 Report Share Posted June 22, 2014 Been running Hitechs for a year.....perfect so far . Quote Link to comment Share on other sites More sharing options...
Nate C Posted June 22, 2014 Report Share Posted June 22, 2014 Ipower are rock solid. Soundequip and Lemac both have them in stock. I would recommend buying an extra charger. The Ipower charger only does 4 at a time and I once killed one putting the batteries in reverse polarity. In fact I am going to buy some more of their 9v in the next couple of days for an upcoming job. Leave some for me Chris. Quote Link to comment Share on other sites More sharing options...
fieldmixer Posted June 23, 2014 Report Share Posted June 23, 2014 I'm running ipower for my um400s but if I had to swap my collection I would try the higher capacity (700mah) beachtecks. Heard good things. Loooong lasting. 2$ per more expensive than ipower but with an extra 180 mah. Trew audio now carries them along side the ipowers. If concerned about reliability ask someone at trew, surely if there were Doa's or failures they would hear about it. Quote Link to comment Share on other sites More sharing options...
chris_bollard Posted June 23, 2014 Report Share Posted June 23, 2014 Will have to get over and pick some up. Good to hear ipower is still the best Quote Link to comment Share on other sites More sharing options...
Ze Frias Posted June 26, 2014 Report Share Posted June 26, 2014 +1 iPower Quote Link to comment Share on other sites More sharing options...
S Harber Posted June 27, 2014 Report Share Posted June 27, 2014 I'm running ipower for my um400s but if I had to swap my collection I would try the higher capacity (700mah) beachtecks. Heard good things. Loooong lasting. 2$ per more expensive than ipower but with an extra 180 mah. Trew audio now carries them along side the ipowers. If concerned about reliability ask someone at trew, surely if there were Doa's or failures they would hear about it. Any word on the Beachteks? I'm about to put in an order for a show and haven't heard much about them yet. I've used the iPower's for years and love them. It's saved a crazy amount of $ in expendables cost, airline baggage costs, and landfill space. How great is that? I really don't get the folks that haven't bought into rechargeables in this day and age. I'd just love to have a rechargeable 9V that will get me to lunch every day. Scott Quote Link to comment Share on other sites More sharing options...
studiomprd Posted June 27, 2014 Report Share Posted June 27, 2014 SH: " Any word on the Beachteks? " available at TREW Quote Link to comment Share on other sites More sharing options...
fieldmixer Posted June 28, 2014 Report Share Posted June 28, 2014 From what I hear, A fresh beachtek 9v will go 7-8 hrs. They will get you to lunch. This is second hand info mind you. A colleague of mine on this group posted his thoughts on them and runtimes. If you search you should find it with little problem. I'm jealous you are getting a fresh batch of rechargeable 9v's. I'm still using my 20+ 4 yr old ipowers. Still working fine but only getting 3-4 hrs on them now. Quote Link to comment Share on other sites More sharing options...
greyfoxx Posted July 1, 2014 Report Share Posted July 1, 2014 Beachteks will power Lectro transmitters (especially the LMa's) for a typical production day. There is a known issue with them fitting in UCR201's if anyone is trying to run them on batteries or as a camera link. Their too big. Quote Link to comment Share on other sites More sharing options...
Jon Gilbert Posted July 1, 2014 Author Report Share Posted July 1, 2014 I'm still using my 20+ 4 yr old ipowers. Still working fine but only getting 3-4 hrs on them now. That's not what I'd call 'working fine' Quote Link to comment Share on other sites More sharing options...
studiomprd Posted July 2, 2014 Report Share Posted July 2, 2014 Jon: " That's not what I'd call 'working fine' " for some, that is enough... Quote Link to comment Share on other sites More sharing options...
TKinney Posted September 17, 2015 Report Share Posted September 17, 2015 I have been using "HighTech" 600ma 9V lithium from Horizon battery.... I have been completely surprised to find that a single 9V lasts most of the day in a UM400,, even though I change them @ lunch. they are WAY better then the previous 300ma ansman I was using. I havent purchased batteries for some time now except as back ups Quote Link to comment Share on other sites More sharing options...
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