My Knog Arc 5.5 headlight bit the dust a couple of weeks inside the 2-yr warranty period. But, since I received it as a gift and don't have proof of purchase, Knog won't honor the warranty -- wouldn't even respond to my warranty request.

So, I took the darn thing apart (NOT easy) and replaced the battery myself. Turns out Knog uses a standard 18650 battery. So I spent a whopping $11 and bought a higher mAh rated battery than what the light originally came with. Charged it overnight, and have been test-running it this morning and thought I'd report my results.

Knog spec'd the light at 1.5 hrs on high -- something I never really witnessed as I typically only got 1 hr max. Thus far this morning, the light has been on high for 3+30 hours and the low battery light hasn't even come on yet. And that's without the cooling benefit of actually being on a bike.

Take that, Knog.

RTFM? https://usd.knog.com.au/userguides

I fail to see the point of your post. Could you enlighten me?

look it up!!

Ask sellers ... walk it back to the shop you bought it from .

mail it to someone who can figure it out for you

Bought online that is another problem ,

saved so much you can throw it away & buy a new one?


"//,,

Thanks for your post. I have been curious about battery replacement on non-user serviceable lights. Way to go!

Dude, I hate to be a jerk, but you're not making any darn sense.

The manuals don't mention anything about replacing batteries in the Arc series, so why did you post a link to the manuals and tell me to RTFM? Did YOU RTFM?

I can't walk it back to a store because I didn't buy it, and I don't know from where it was originally purchased. I did a google search, and couldn't find ANYTHING referencing battery replacement on the Arc series. Can you find something?

The whole reason I posted my experience is because there's zilch on the internet about replacing the batteries in these things.

I assumed all these all in one, brand name lights were like iphones, and some other smartphones, with a built in battery, that could be replaced, carefully and tediously. I also assumed most of them used 18650 lithium ion batteries of varying capacity. Could you please provide some details as to what this replacement entailed? Was it protected cell? Tabs to solder wires to? TIA

Mail it here And I may be able to see It. otherwise it's waiting for someone buying exactly what you did..




'/,

Remove the trim that surrounds the lens. There are four phillips screws holding the lens in place -- Knog fills these in with epoxy so you can't use them. I dug out the epoxy with a razor blade. Unscrew and remove the lens, and you'll see the LED circuit board. There are three black 1.5mm allen bolts; unscrew these. This loosens the heat shield from the body of the light that holds the battery. Gently slide the heat shield (with the circuit board still attached) forward, and it will reveal the 18650 battery compartment (spring loaded on negative end). Remove / replace battery, and perform steps in reverse to reassemble.

I should've taken pictures, but didn't really think of it at the time.

Thank you!

UPDATE

Received an email from Knog this morning stating that they would honor the warranty and have a replacement light on its way to me. I should receive it in 10-15 business days. Color me impressed.

Beautiful, potent, but bad design, adding a mechanical element to an electronic device, constant bending/moving, it may be repairable though.