One problem is that they produce too constant a voltage so you don't get any warning of a low battery,
Surely not a huge issue? Just have a spare lying around. When it dies, swap out and recharge.
Just have a spare lying around
These things are upwards of £10 per battery. And a lot of things that take D cells take lots of them.
My Mr Beams lights all take three batteries. So you're right that'd be £60 per light.
@grams started
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Surely not a huge issue? Just have a spare lying around. When it dies, swap out and recharge.