scalpy Posted February 23, 2019 Share Posted February 23, 2019 Hi all, just a quick question about the battery life on Sire V7s. Mine has been getting its first show outing this week and rather fun it has been too, but it struck me I don’t know what the symptoms are if the battery runs out. Obviously passive mode is there to save the day but I don’t want to have any noise or indeed a complete cut out. I reckon the batteries have done about 15 hours so far. Any help would be most appreciated, thank you. Harry Quote Link to comment Share on other sites More sharing options...
chris_b Posted February 23, 2019 Share Posted February 23, 2019 I've had batteries run down in my Wal and a Lakland. They both sounded different, but started quietly so I had plenty of time to sort them out. One produced a swishing noise and the other started to distort. The batteries in the Lakland lasted more than a year. That was over 100 gigs. So I now change the batteries on the 1st January. I save the old one and put it into my tuner. I might be extending the battery life by running the volume at about 3/4. So the bass volume is down a little with the amp volume doing the heavy lifting. 2 Quote Link to comment Share on other sites More sharing options...
itu Posted February 23, 2019 Share Posted February 23, 2019 2 hours ago, chris_b said: I might be extending the battery life by running the volume at about 3/4. So the bass volume is down a little with the amp volume doing the heavy lifting. This is something I am not so sure about. Usually op amp -based solutions consume low amounts of current depending on the op amps. Older ones like NE5534 (Alembic, anyone?) may consume 4 mA and modern counterparts less than 1 mA. This is the most current hungry component in your preamp. A 9 V battery capacity is around 500 mAh. If the preamp consumes 1 mA, this leads to 500 hours of playing. EMG claims that their pickups run 1000 hours, so they consume 0.5 mA. If you run your preamp (in the bass) with less than full signal, it actually dissipates some of its power, so warms up. My choice is the sound, so I run full signal from the bass. 1 Quote Link to comment Share on other sites More sharing options...
Grahambythesea Posted February 23, 2019 Share Posted February 23, 2019 I think it also depends on the quality of the batteries. Test them to see what life they have, or just change it before an important gig to make sure after all they don’t cost a fortune and take a spare in your case/gig bag. 1 Quote Link to comment Share on other sites More sharing options...
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