Never mind the p*nct*re fairy ...

[hackbike 666]

I cleared out my commuting bag on Monday and found about twenty spare batteries which were a bit manky as they had been rubbing together on my commmutes.I now have 4 spare AA and 3 spare AAA batteries (Alkaline) (wrapped in tape or still in the packet.
A spare front and two spare rear lights.

 

[swee'pea99]

Oh, don't worry about the zealots. Cheapo flashing LEDs are fine for urban riding. Just change the batteries when they need it...don't ever think 'oh, they're a bit feeble but I'll get another ride out of them'. If you notice they're anything other than bright 'n shiny, change the batteries now.

 

[wafflycat]

Spare batteries should be an automatic part of your kit you take with you when out cycling. Just as important as spare inner tube(s), puncture kit, pump...

 

[HLaB]

I went out for 55 miles mostl in the dark last night; only to discover when I went to fit the lights I had 3 front lights and only 1 rear I never had a problem though the Smart Superflash seemed very effective.

 

[arallsopp]

Dynamo works for me. Lovely it is too.

But I do have a spare battery front and rear in the bag just incase. Batteries get changed about once a year, and normally migrate into a remote control for the TV.