we just bought the Bigbox for use as a primary pre. it runs on (2) 9 volt batteries (got 2 trays for hot swapping). There is no external input for a battery of any kind. While Naiant offers custom internal batteries it may be more pricey than we intend for a $220 pre...so, i am content to use the 9 volt, no worries.
What Im not totally content on is using throwaway batts. Im no squirrel pettin tree hugger, but i do hate the idea of throwing away batt after batt after batt.
Ive inquired amongst friends about rechargable 9 volts and gotten mixed response. Some say the discharge curve is unpredictable. Others have told me, fine, no worries, theyve had good luck/no issues with rechargables.
Obviously we wouldnt cut corners, we only need 2-4 batts, so we could buy the best in rechargables.
What say you TS, will rechargable 9-volts be a reliable option??