Mike:
I keep a P60 in one 6P and a P61 in a 3P extended with an A19. The P61 in 6P is reserved for car emergencies.
I use the more cost effective P90 with a 9P.
I use another 9P extended with a pair of A19's and loaded with 4 @ 2000 mAh 4/5 A Panasonic NiMHs to run P61's for extended run times. Say the word and I'll send you 4 of these cells with your WA 01111 bulb shipment. (Did you ever get a universal AAA, AA, A, sub C, C, D and 9V charger like the Vanson BC-1HU that can also charge these 4/5 A cells?)
It's nice to note that relatively spent 123's that drive a P60 very dimly drive my KL3 nicely.