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I wasn’t hating on batteries. I use them in conjunction with a dynamo.
In fact I was advocating them for a lot of people, as they really don’t ride in the dark much they have less need for a dynamo.
My text wasn’t worded well. I meant if you like riding st night (riding all night, and sleeping during the day) you’ll find a dynamo really useful.
However, if (like most) you sleep most hours of they dark, a battery setup will work just fine.
skinny
Don't knock it until you've tried it!
There are good reasons to use dynamos but some of that is not right: battery lights are perfectly fine for riding all night and it only takes 5 hours max to recharge battery packs (if you have the right charger) so they don't compromise any sleep strategy that has more than one 5-hour hotel stop on the entire TCR (that is what Rimas actually did, using my batteries, last year!) And batteries don't weigh anything like a kilo.
The threshold power calc is based on an 'average' rider with a threshold of say 240W who is likely to be down to c.120W, 50% of threshold, after the first couple of days. Most dynos take about 6W when they're on which is 5% of 120W. With the dyno, he is down to 114W, making it equivalent of 50% of a 228W threshold.
I'm not trying to evanagelise about not using dynos, but if someone asks for the info it's only fair to give them it!