ICE amps need cooling?

Most recent JRDG amps use SMPS, including the 312 stereo, which is designed around the ASP1000 module. While 300 series amps have substantive cast Aluminum cooling fins, I suspect these may be more cosmetic than anything else, as the external temp of 312 never grows much above look warm. It is worth pointing out that at approx $16K, the 312's price point is not exactly consumer grade, yet Jeff Rowland determined that an SMPS front loaded by a PFC unit would yield a musical performance superior to that of the previous 302 model, which used a linear power supply instead. . . and I do agree with him. Issue 188 of TAS should just be reaching the newsstands. . . it contains a sidebar that I have written on the JRDG 312 amp--part of my review article on Vienna Mahler speakers.

On the subject of battery PS, JRDG has implemented a battery PS on its new Criterion linestage flagship. . . which hopefully will ship before year end. G.

Batteries are potentially messy and some can emit either fumes or hydrogen gas. Enough battery power for a pair of BelCanto 1kw monoblocs would take up a bunch of space, too.
Than you gotta deal with the charger and battery maintenance.
You would ALWAYS run the batteries down at the WRONG time. that is one of the RULES.
But, on the other hand, I just received an IR amplifier module, stereo class 'd' which I intend to power with batteries. Amp takes +-50v which is good for 4x12 on each rail. I'll deal with the charging and other issues later. The attraction of zero ripple and huge, near-instant current is very seductive.
Battery chemistries other than lead-acid / gel cell is available in Lithium/Lithium polymer and varios Nickel Metal Hydride cells along with the old standby, NiCad. I don't know the half cell voltage of these, but some require smart chargers (the charger, not YOU) and certain other usage restrictions.
For DIY where there are few restrictions, it's worth an experiment, but in the commercial market, batteries may be too much.
Also, a note on the numbers:: IF you run at what works out to be high power levels, say 4 amp total average draw, on each 'rail', you may need considerable battery capacity. A set of batteries in series will have the amp hour capacity of 1 battery.....1 12v battery of 50amp/hours will still have 50amp hours when 4 are in series....but have 4X the WATT hours.(P=IE) But, measuring in amp hours, my made-up 4amp draw, per rail, will use up each rails batteries in 10 hours of listening, with a small reserve.
Clearly, in this instance you couldn't run a Class 'A' system, but rather the numbers prefer Class 'D'.....

Magfan, the old JRDG model 9 mono amp used sealed Lead acid batteries. It as a class A/B design. Conversely, the JRDG Criterion linestage uses industrial-grade NiMH and has a built in smart charger.

maab you are more then correct far far away from high end sound we crave.