leesteel Posted February 24, 2016 Share Posted February 24, 2016 Does anyone here know how many volts the new JTV batteries put out? Quote Link to comment Share on other sites More sharing options...
Charlie_Watt Posted February 24, 2016 Share Posted February 24, 2016 Around 7V Quote Link to comment Share on other sites More sharing options...
leesteel Posted February 26, 2016 Author Share Posted February 26, 2016 Just wondering if it would be possible, Charlie, to retrofit the new rechargeable battery into a 500. I'm handy with electronics and could adapt the actual connector but hmmm 7v and the 500 is expecting 9v (6 AA batteries @ 1.5v each). However, the VDI cable from the HD supplies the same voltage to both JTV and older variax models, so there is still the potential for this to work….. Any thoughts? Quote Link to comment Share on other sites More sharing options...
Charlie_Watt Posted February 26, 2016 Share Posted February 26, 2016 Yes you could do that but the battery box on the JTV is an important piece of electronics that protects the battery from being discharged too far. I have run my 500 from a 2 cell lithium battery meant for RC airplanes and it works just fine but there is no protection from over discharge. Lithium batteries will die if you ever discharge them too far. All things that are designed to use them have protection circuits in them to shut off the load if the battery gets too low. That stuff is in the JTV battery case with the 4 LED's that tell you the battery level. I have also run my 500 off of rechargeable NIMh batteries which only put out around 7.5V when they are nearly discharged. I have two sets of 6 of those that I swap in. I get a good 4-6 hours of playing time on a set. They are 2200MaH batteries. The 500 draws about 500mA when it's on. The circuits run on 5Volts - there is a regulator that drops the battery down so 7 - 9 Volts works just fine. It stops working when you go much below 7 though. The regulator needs almost 2 volts above 5 to work. Quote Link to comment Share on other sites More sharing options...
leesteel Posted February 26, 2016 Author Share Posted February 26, 2016 Someone has the actual battery box with circuitry on eBay….. That is what gave me this wild idea. Quote Link to comment Share on other sites More sharing options...
psarkissian Posted February 26, 2016 Share Posted February 26, 2016 Between 7 to 8 Volts. They top out at +8.35 Vdc. Quote Link to comment Share on other sites More sharing options...
psarkissian Posted February 26, 2016 Share Posted February 26, 2016 9-Volts would be a maybe. Yes, the regulators would play a role. Regulators in general have a +/- percentage of voltage of regulation range. Go beyond that and it stops regulating. When that happens, the circuit can either shut down or blow-up (as happens with hover boards and Sony portable disc players when you don't use a Sony battery and the batteries diode fails). It may throw off the power management circuit's reference points when using a 9-Volt rail like that. Might work. Just be aware of those things. Quote Link to comment Share on other sites More sharing options...
Charlie_Watt Posted February 27, 2016 Share Posted February 27, 2016 The JTV battery is well within the range to work on an older Variax. Quote Link to comment Share on other sites More sharing options...
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