I'm currently running a dynamo-powered Lumotec IQ Cyo R head light, and using a Dinotte 200L to enhance/brighten the area directly in front of the wheel/tire (to avoid debris, etc). The Dinotte is overkill for that task, and mounting the battery pack can be a bit tricky if I'm not using my front panniers.
I'd like to replace the Dinotte with a small stand-alone light similar in power to a Planet Bike Blaze 2-watt, or Cygolite 150/NiteRider MiNewt 150. If I went the Planet Bike route, I'd need to change the batteries approximately once a week, which means opening the case, etc. If I went with the all-in-one approach, I'd only have to remove the light from the mount/clamp.
Do the cells in the all-in-one units compare favorably to separate rechargeable batteries?