Well, when I went into the Battery store last summer my intention was to get a 7ah SLA. I guess when I had all the candidates lined up I bought a 5ah battery instead. I guess the smaller size and weight seemed ok at the time. But I really thought I had bought a 7.
Last night had my first ride in the dark on unlit two lane road. The lights worked great. First time I've ridden at night and really enjoyed it. Unfortuanately the 5 just doesn't have the oomph to drive the dual 20watt lamps very long. I definitely experience the battery current limitation effects. Guess I'm going to have to rethink the battery/battery box compnents.
On the other hand, the Whelan TIR3 connected to the 12v battery is an eye blinding experience. It's so bright that when I take a lane cars stay 40-50ft back. Very impressive. Maybe I'll add another.