Eds0123

My commute to work and back is 12 miles or 40 minutes each way, and I just use my lights at lowest brightness setting since 99% of my route is on nice low to no trafgic bike paths, I don't need 3-4 hours full brightness and I don't need full hefty heavy battery pack, looking for something smaller and lighter because going back home i have a 600 feet long steep climb after a day of 11 or 12 hours at work. Trying to shave as much weight to make the long steep climb home maybe a bit easier, Any light (no pun) weight battery pack anyone might know of? I can charge batteries overnight every night if needed, Thanks

fietsbob

What batteries does it use now?

Consider going to a hub dynamo wheel and wired LED lights ...

then your battery amp / hour capacity limitations disappear ..

Eds0123

I just installed hub dynamo on my other touring grocery getter bicycle, but still deciding what head/tail lights to get to go with it, my commuter bicycle is about maybe 10lbs lighter and is very very fast, I'd like to stick with battery power lighting on it for now, The battery pack I have now is 4 in series Li Ion 18650 single cells. I don't want to break it up in half or in singles and resolder it to the charger.

CliffordK

I picked up a pair of dice lights off of Craigslist a while ago. Android USB rechargeable.

https://cygolite.com/product/dice-hl-150-usb/



The headlight seems to have a low beam, medium beam, high beam, and two flashing modes.

So far I rarely use it on high, but have used it on low and medium, and haven't completely drained the battery yet.

Straps seem to be holding up, and are reasonably adjustable for different sizes of tubes.

And, it fits in front of your handlebars, so it doesn't really interfere with stuff on top of the bars.

Manster

A quick look at all-battery.com shows they have 14.8V (4 in series Li-ion) 18650 packs weighing (a hefty?) 7 oz. with 2600mAh capacity. They also have a smaller 14.8v LiPo pack at 2.7oz with 800mAh capacity for the same price. Maybe you could drop that in and shave off 4oz, as well as shaving off 2/3 of your run time. I say maybe because Li batteries have very specific charge and discharge requirements. The packs I refer to have PCBs for protection, which goes a long way to avoid risk of fire or explosion, but you would still need to check compatibility with your charger etc.

01 CAt Man Do

Your 12 mile commute almost sounds exactly like mine with the exception that mine is entirely on roads. If I choose to commute by bike I have a particularly steep half mile long hill to climb on a windy little backroad. Not something that is particularly fun after working 9.5hrs and riding home at 2:00 in the morning. After that I have another long climb but more moderate. Nope, most of my ride home would be almost entirely going up hill which is why I don't do it...lol. Anyway, one of the reasons I'm considering an e-bike for commuting.

About your light needs; Hate to sound like I'm stumping for Raveman lights but since I did receive from them a couple lights to review ( for free ) I guess this does sound like a shameless plug. Nevertheless, one of the CR series would do you really nicely. These lights are totally self-contained and can be recharged via USB. The CR-500 runs about 1.5 hr on high., medium about 2.5 hr. I use the CR-900 since it is brighter and has longer run time. The mid-mode on the 900 is just about perfect and will run for over 2.5 hrs ( @ around 400 lumen ). If you are riding mostly paved paths you should be using a lamp that provides a cut-off beam pattern and the Raveman lights give you just that. Now if you want something with more throw and aren't worried about cut-off beam patterns than you might just go with a standard 18650 cell torch like the Convoy S2 mounted to the bars. I own a couple of those myself and on occasion use one for back-up purposes. All of the stuff I mentioned will run a long time if using the medium or low modes.

I don't think you want to go too small. Dinky little lights don't provide much light and don't have much run time.

znomit

A dual cell 18650 battery will save you about 3oz from a 4 cell.
Not the place to look for weight savings.

CliffordK

Are you sure he meant to lose the 15 pounds off of the weight of your bike?

fietsbob

30 + years ago I built a 5 D cell battery pack myself.. 5 individual battery holders from Radio Shack
in a row.. wired in series rechargeable batteries 1.2v each x 5 = 6v..

halogen bulb headlight .6w tail light draws what it needs ..

12 miles took me an hour ,

recharging daily was a PITA .. chargers only took 4 at a time..
so I had 10 D batteries to have a charged set swap..

generators had more drag then , than hub dynamos do now ...

they're almost unnoticeable ..





...

noglider 

The weight of your light will not affect your travel effort.

znomit

Cheap and good:
https://kaidomain.com/bike-lights-and...n-Battery-Pack