Zippy, contact Mark/Smudge at MTB batteries, I’m sure he can help you out.   See recent thread.

Charging before it’s flat shouldn’t hurt no.

Occasionally there are some deals on the smaller support cells if you look hard.

Exposure recommend that the light is left on charge when not in use, regardless of what the charger is indicating. Apparently it helps the battery life.

I ride with a Joystick and carry a second in my back pocket. I got 2:45 till death starting on full power for my newest Mk12. The older one is lower power. I’ve used a small juice pack and their own USB cable for over-night riding whilst charging on the fly. To be honest, carrying a spare is a better solution for my night riding.

Yes, leave it on charge. The last portion of the battery’s capacity is trickle-charged very slowly towards the end of the cycle after the green light goes on, I can remember reading. For some reason – high output / small-ish battery – this seems to be particularly crucial with the Diablo.

Q:What should I do if my light is not lasting as long as expected
A: To ensure maximum charge is achieved we recommend the lights are left on charge for a while after 100% is displayed (you cannot damage or overcharge the battery). Please make sure the light is fully charged and then reselect the desired program before use to see if this rectifies the issue. If this does not help then please contact our service team on service@use.group and we can best advise how to proceed.

Snudge made me a faux-Exposure back-up battery a few years ago, still going fine. The one plus of the Exposure single cell back-up is that you can mount it super neatly on the back of a helmet. The downside is that it uses the Smartport, so you can’t then also use a remote switch or any other accessory AND the battery. You also need to connect it from the start rather than adding it when the main battery goes south. it’s effectively charging the main light battery as you go, I think.

There’s a whole bunch of other stuff in the Exposure FAQ section:
https://exposurelights.com/frequently-asked-questions

Q: My light appears to be losing charge when not in use, what can I do?
A: We have found that unplugging (or turning off) the charger before removing the charger jack from the light can cause a circuitry component to pull current when unplugged resulting in a slow drain of charge. Unplugging the charger jack from the light before turning off or unplugging the charger from the mains should stop this happening.

My Diablo lasts one and a half longer rides home. Will charging it every night even though the indicator light is still green harm it?

Li-ion batteries are fine to charge when not fully depleted. The older NiCd / NiMH rechargeables were less happy about being charged when not fully depleted (memory effect), which is why people still worry about it.

That FAQ entry sounds like a bug in the driver circuit. Bit lame to post a work around rather than fix it!

Nobeerinthefridge

Member
Or, you’ve bought the wrong light for your requirements.

My nightrides rarely last longer then 2 hours, so my Diablo on full tilt covers this. I don’t bother with a light on the bars either, only ever ride with a helmet light as I want to see where I’m looking, not where the bikes pointing.

YMMV.

Definitely a case of YMMV – my fully-charged Diablo died on me on a two hour spin last night, and I only ran it full tilt for the downs. This may not be a good sign.

A diablo doesn’t get close to 2 hours on full tilt. They claim 1 hour currently (claimed 1.15 when I got mine). I’m my experience your lucky of you get that. Even toggling mine it fails around 1.30 normally. It also annoyingly forgets the mode choice (I like the 2 step hi/lo option) all the time.