Go Back  Bike Forums > Bike Forums > General Cycling Discussion
Reload this Page >

Custom lamps system with detachable battery box

General Cycling Discussion Have a cycling related question or comment that doesn't fit in one of the other specialty forums? Drop on in and post in here! When possible, please select the forum above that most fits your post!

Custom lamps system with detachable battery box

Old 12-20-19, 03:21 PM
Thread Starter
Join Date: Dec 2019
Posts: 31
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 11 Post(s)
Likes: 0
Liked 12 Times in 7 Posts
Custom lamps system with detachable battery box


I've been looking at bike lighting systems on the web, from the new-fangled contactless 'dynamos', through LED and vintage. For my needs, fixed old-fashioned switched battery lamps will suffice.

I'm thinking of rewiring the front and rear lamps so that all the wiring comes together at a discreet and removable under-saddle battery box. This would contain two pairs of rechargeable batteries with a switch to change between the two pairs. When one pair dies, I simply click to connect to the other pair. The lighting is for 'being seen' rather than 'seeing' purposes (city street riding), so I think a pair of batteries would be enough to power both lamps.The battery box would come off for recharging, so a simple plug and socket would be required.

I like this idea, but...feeding the wires through the frame so that as little wiring as possible is visible? So far, I've thought of feeding thin wire through the frame and somehow catching it and pulling it through small drilled holes with wubbewy grommets. Yeah..."somehow" . Anyone done this kind of custom wiring? Any tips?


Last edited by robalong; 12-20-19 at 03:31 PM. Reason: Punct,uation correction
robalong is offline  
Old 12-20-19, 03:50 PM
SE Wis
dedhed's Avatar
Join Date: Apr 2005
Location: Milwaukee, WI
Posts: 6,989

Bikes: '68 Raleigh Sprite, '02 Raleigh C500, '84 Raleigh Gran Prix, '91 Trek 400, 2013 Novara Randonee, 1990 Trek 970

Mentioned: 26 Post(s)
Tagged: 0 Thread(s)
Quoted: 1365 Post(s)
Liked 814 Times in 554 Posts
dedhed is online now  
Old 12-21-19, 08:10 AM
Senior Member
Join Date: Sep 2017
Posts: 2,440
Mentioned: 24 Post(s)
Tagged: 0 Thread(s)
Quoted: 1580 Post(s)
Liked 1,795 Times in 843 Posts
robalong , you might ask a moderator to move this thread to the Electronics and Lighting subforum. You might get more responses there.
Koyote is online now  
Old 12-23-19, 04:34 AM
Senior Member
jgwilliams's Avatar
Join Date: Aug 2004
Location: Surrey, UK
Posts: 571

Bikes: Planet X Carbon Pro Evo SRAM Force, custom built 653 and 531 bikes with frames by Barry Witcomb, Giant XTC 4 mountain bike and a Brompton folding bike.

Mentioned: 5 Post(s)
Tagged: 0 Thread(s)
Quoted: 183 Post(s)
Liked 45 Times in 34 Posts
Well, each to their own, of course. But nowadays there are so many really good, completely self-contained, rechargeable lights that will go for hours between charges that what you are proposing seems like a lot of work for no appreciable gain. If you were thinking about really powerful lights for seeing with it might be another matter. My Cateye Rapid rear light runs for two weeks or more of my commute, amounting to around 10 hours per week. My front light is a very beefy one so only does two days but I'm sure you could find a front 'flasher' that would last a similar time and be almost as compact as the Rapid.

If you're determined to go ahead with your scheme there are some very neat solutions for that too. One I've seen involves feeding cable up the steerer tube and replacing the cap on the steerer with one that includes a USB socket, so you plug your light into the USB socket. I guess it's probably designed for a dynamo as feeding a cable from the saddle would involve going down through the bottom bracket and then coming out under the down tube. Very hidden, though.
jgwilliams is offline  
Likes For jgwilliams:
Old 12-23-19, 06:19 AM
Senior Member
indyfabz's Avatar
Join Date: Jan 2010
Posts: 28,059
Mentioned: 196 Post(s)
Tagged: 1 Thread(s)
Quoted: 12093 Post(s)
Liked 4,017 Times in 2,112 Posts
I feel it's my civic duty to elaborate on the above. This is a mere 500 lumens in total darkness on a wooded trail. USB rechargeable. Lasts for an extremely long time on flash mode. Also has two steady brightnesses. The giant porcupine heading towards me just before I snapped the photo was able to see me and veer off into the woods.

indyfabz is online now  
Old 12-25-19, 05:33 PM
Senior Member
Join Date: Jul 2017
Location: SE Wisconsin
Posts: 70

Bikes: Trek X-Caliber (2020), Trek Trek Madone 5.1 (2011), Trek 1400 (1991)

Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 27 Post(s)
Liked 27 Times in 16 Posts
Looking at the web site, it lacks any electrical details/specifications that one would help determine its suitability for OP's plan for battery charging. The lamp and "dynamo" are integrated. Attempting to tap into one of these units to run wires and reworking the case to be weatherproof again would be very difficult without possibly ruining the unit.
Buzzkill53120 is offline  

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Thread Tools
Search this Thread

Contact Us - Archive - Advertising - Cookie Policy - Privacy Statement - Terms of Service - Do Not Sell My Personal Information -

Copyright 2018 MH Sub I, LLC dba Internet Brands. All rights reserved. Use of this site indicates your consent to the Terms of Use.