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In the Forum: Audio Discussions
In the Thread: It’s mad, mad, mad... electricity.
Post Subject: Get rid of battery...Posted by Romy the Cat on: 6/4/2014
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 Paul S wrote:
It surprises me if you wish to do away with the battery. Or, perhaps a unit could be offered "less battery", which the purchaser/user could add on his/her own. This would "solve" the logistical problems (and the expense) of shchlepping batteries, at least for the "manufacturer"/sales/service people. Surely, anyone could follow instructions and get a decent battery (or batteries) on his/her own.

Well, if I would make the Purepower-like unit from scratch then the subject of buttery would be very much under discussion and scrutiny. The Purepower generator itself is not a reference in decision to use battery. The battery started as an adoption of commercially available computer UPS and for those devises to temporarily power the load without main voltage is critical, at least unit the backup power generator kick in.  So, the presents on battery in UPS device is perfectly reasonable.

Now if e are taking about Purepower-like Audio-ONLY unit then I do not think that UPS functionality is important at all. The unit shall; have some kind of buffer to sustain voltage for let say 50 periods to absorb any short term issues but it no need to run playback from battery. So, using a large caps would store the necessary  energy and no battery would be in the picture.

By getting rid of battery we obtain a lot of benefits, size, weight, the whole charging circuitry, the switching logic - all of it goes. The question is how would it affect sound. The battery acts as an ultra low DCR capacitor and it very much might improve sound. The Purepower itself might run with no battery, I did not try it but I do not think it would be good as battery has no large ultra low DCR caps parallel with battery. I think Purepower uses 470uF cap  but if I do not have battery I would like to have in there let say 1-2F. For sure it is imposable to make any prediction and no one would experiment with Purepower but the opportunity to get rid of all charging and switching logic is very lucrative. In fact that was what constantly did not work well with Purepower.

Me

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