Another homemade bike light

Discussion in 'Road Cycling' started by atgcpaul, Oct 10, 2003.

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  1. atgcpaul

    atgcpaul Guest

    I've used my dual beam Jet Lites for 3 seasons and it's seems the batteries are kaput. I charged
    them up the other day and the battery was warm as they usually are after charging but no lights. I
    only use them during Daylight Saving Time so they've been sitting around for several months. Anyway,
    a new battery pack from them will cost me $150 which seems ridiculous. I took the pack apart and it
    seems pretty simple to do. It's 11 NiMH batteries wired in series. It's 13.2V total so 1.2V per
    battery at 350mAh each (3800mAh total). I'd like to just replace the batteries but most premade
    packs are underpowered compared to these. Would I need to get a whole new charger for less volts? If
    I switched to lead acid or NiCd, would I need a new charger, too?

    Thanks, Paul
     
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  2. Arpit

    Arpit Guest

    On Fri, 10 Oct 2003 06:40:47 +0000 (UTC), [email protected] wrote:

    > I've used my dual beam Jet Lites for 3 seasons and it's seems the batteries are kaput. I charged
    > them up the other day and the battery was warm as they usually are after charging but no lights.
    > I only use them during Daylight Saving Time so they've been sitting around for several months.
    > Anyway, a new battery pack from them will cost me $150 which seems ridiculous. I took the pack
    > apart and it seems pretty simple to do. It's 11 NiMH batteries wired in series. It's 13.2V total
    > so 1.2V per battery at 350mAh each (3800mAh total). I'd like to just replace the batteries but
    > most premade packs are underpowered compared to these. Would I need to get a whole new charger
    > for less volts? If I switched to lead acid or NiCd, would I need a new charger, too?
    >
    > Thanks, Paul
    nope, 350 mAh total. if your interested, ill explain it. ill pull out my jkarcar catalogue and check
    the price of NiMH batteries. 350mAh seems ridiculously small though. My battery is 7000mAh. If you
    buy AA NiMH batteries, you can get 11 for 36 dollars 30 cents, with solder tabs, jaycar cat sb-1732.
    THese are 1200mAh, and if you have a smart charger it may well mean you need to get a new one.
    Ifyour charger is just a plugpack thingey, youll just need to leave it connected longer. if its a
    120mA charger, youll need to leave it connected for 15 hours, if its a 350 mA charger youll need to
    connect it for 5 hours. If its a 1200 mA charger, you need to leave it connected for 1.5 houirs.
    THats the lighter solution. another option is to go with lead acid battery, they really will be tiny
    if you only want a bit of capacity. A 1300 mAh would suit your purposes very well, and is only
    97mmdx43mmx57mm. because its so small, it may well be lighter than the nimh batteries, because it
    doesnt have so much packaging. If its heavier it wont be much so. It'll be more
    elgant becasue you dont have to solder lots of batteries together, and you can
    attach it direct to a bar with cable ties. Its also VERY rugged, so good for
    offroading. Its $24.95 , but you need a special charger for 33 dollars.

    I wouldnt really reccomend using a light which was designed to work with 350mAh batteries off road
    though. If you ever cycle near the st ives area maybe i can show you my battery and light sometime
    :) 55 watts >:)
     
  3. GregR

    GregR Guest

    On Fri, 10 Oct 2003 06:40:47 +0000 (UTC), [email protected] wrote:

    > I've used my dual beam Jet Lites for 3 seasons and it's seems the batteries are kaput. I charged
    > them up the other day and the battery was warm as they usually are after charging but no lights.
    > I only use them during Daylight Saving Time so they've been sitting around for several months.
    > Anyway, a new battery pack from them will cost me $150 which seems ridiculous. I took the pack
    > apart and it seems pretty simple to do. It's 11 NiMH batteries wired in series. It's 13.2V total
    > so 1.2V per battery at 350mAh each (3800mAh total). I'd like to just replace the batteries but
    > most premade packs are underpowered compared to these. Would I need to get a whole new charger
    > for less volts? If I switched to lead acid or NiCd, would I need a new charger, too?
    >
    > Thanks, Paul
    www.batterystation.com

    FYI - 11 350mah battereis wired in series has a capacity of 350mah. Its likely that they are the
    HR-4/3FAUX 4500mah batteries, many of the 12v bike systems use this battery (niterider for sure).
     
  4. atgcpaul

    atgcpaul Guest

    GregR wrote:
    : On Fri, 10 Oct 2003 06:40:47 +0000 (UTC), [email protected] wrote:
    :
    :> I've used my dual beam Jet Lites for 3 seasons and it's seems the batteries are kaput. I
    :> charged them up the other day and the battery was warm as they usually are after charging but
    :> no lights. I only use them during Daylight Saving Time so they've been sitting around for
    :> several months. Anyway, a new battery pack from them will cost me $150 which seems ridiculous.
    :> I took the pack apart and it seems pretty simple to do. It's 11 NiMH batteries wired in series.
    :> It's 13.2V total so 1.2V per battery at 350mAh each (3800mAh total). I'd like to just replace
    :> the batteries but most premade packs are underpowered compared to these. Would I need to get a
    :> whole new charger for less volts? If I switched to lead acid or NiCd, would I need a new
    :> charger, too?
    :>
    :> Thanks, Paul
    : www.batterystation.com
    :
    : FYI - 11 350mah battereis wired in series has a capacity of 350mah. Its likely that they are the
    : HR-4/3FAUX 4500mah batteries, many of the 12v bike systems use this battery (niterider for sure).

    Well, that does explain a lot. Thanks. The system is 3800mah. It's been too long since high school
    physics. I will try to look for those batteries. Additionally, I do believe my charger is "smart" to
    some degree. From the manual I am able to leave it plugged it and it will do a "trickle" charge once
    the battery is full. If I go with the higher capacity battery, does that mean the charger will take
    longer to charge or is it just incompatible after 3800mah?

    Thanks again
     
  5. Joe

    Joe Guest

    On Fri, 10 Oct 2003 06:40:47 +0000 (UTC), [email protected] wrote:

    > I've used my dual beam Jet Lites for 3 seasons and it's seems the batteries are kaput. I charged
    > them up the other day and the battery was warm as they usually are after charging but no lights.
    > I only use them during Daylight Saving Time so they've been sitting around for several months.
    > Anyway, a new battery pack from them will cost me $150 which seems ridiculous. I took the pack
    > apart and it seems pretty simple to do. It's 11 NiMH batteries wired in series. It's 13.2V total
    > so 1.2V per battery at 350mAh each (3800mAh total). I'd like to just replace the batteries but
    > most premade packs are underpowered compared to these. Would I need to get a whole new charger
    > for less volts? If I switched to lead acid or NiCd, would I need a new charger, too?
    >
    > Thanks, Paul

    Why not have your battery rebuilt at much less than the cost of a new one? Try one of these outfits:

    The NiCad Lady (Grace) http://nicdlady.com/ or (909) 653-8868. She also sells NiMh. You can get
    individual cells or she can assemble custom configurations at a reasonable price.

    or get a quote from:

    PRIMECELL DIVISION CUNARD ASSOCIATES INC.

    http://www.primecell.com/index.htm
     
  6. Arpit

    Arpit Guest

    On Fri, 10 Oct 2003 10:44:56 +0000 (UTC), [email protected] wrote:

    >GregR wrote:
    >: On Fri, 10 Oct 2003 06:40:47 +0000 (UTC), [email protected] wrote:
    >:
    >:> I've used my dual beam Jet Lites for 3 seasons and it's seems the batteries are kaput. I
    >:> charged them up the other day and the battery was warm as they usually are after charging but
    >:> no lights. I only use them during Daylight Saving Time so they've been sitting around for
    >:> several months. Anyway, a new battery pack from them will cost me $150 which seems ridiculous.
    >:> I took the pack apart and it seems pretty simple to do. It's 11 NiMH batteries wired in
    >:> series. It's 13.2V total so 1.2V per battery at 350mAh each (3800mAh total). I'd like to just
    >:> replace the batteries but most premade packs are underpowered compared to these. Would I need
    >:> to get a whole new charger for less volts? If I switched to lead acid or NiCd, would I need a
    >:> new charger, too?
    >:>
    >:> Thanks, Paul
    >: www.batterystation.com
    >:
    >: FYI - 11 350mah battereis wired in series has a capacity of 350mah. Its likely that they are the
    >: HR-4/3FAUX 4500mah batteries, many of the 12v bike systems use this battery (niterider for sure).
    >
    >Well, that does explain a lot. Thanks. The system is 3800mah. It's been too long since high school
    >physics. I will try to look for those batteries.

    AAAAAAAAAAAAAAAAHHHHHHHHH, dont bother. YOu'll get them for 7-0 dollars each. Still way
    expensive. Go SLA.
    >Additionally, I do believe my charger is "smart" to some degree. From the manual I am able to leave
    >it plugged it and it will do a "trickle" charge once the battery is full. If I go with the higher
    >capacity battery, does that mean the charger will take longer to charge or is it just incompatible
    >after 3800mah?
    could be either. could be that it wont charge them completely. depends on the design.
    >
    > Thanks again
     
  7. Joe

    Joe Guest

    On Fri, 10 Oct 2003 12:29:54 GMT, Joe <[email protected]> wrote: Thanks, Paul
    >
    >Why not have your battery rebuilt at much less than the cost of a new one? Try one of
    >these outfits:
    >
    >The NiCad Lady (Grace) http://nicdlady.com/ or (909) 653-8868. She also sells NiMh. You can get
    >individual cells or she can assemble custom configurations at a reasonable price.
    >
    >or get a quote from:
    >
    >PRIMECELL DIVISION CUNARD ASSOCIATES INC.
    >
    >http://www.primecell.com/index.htm

    One other outfit with nationwide outlets you might want to try is: Batteries Plus

    http://www.batteriesplus.com/
     
  8. atgcpaul

    atgcpaul Guest

    Arpit <[email protected]> wrote:
    : AAAAAAAAAAAAAAAAHHHHHHHHH, dont bother. YOu'll get them for 7-0 dollars each. Still way
    : expensive. Go SLA.

    Thanks to all the replies! I found the same batteries at batterystation.com for $2.50 each
    ($27.50 for 11). Another place has 10 C cells for $23 giving me 12V at 4500mah--700 more than
    what I have now. The lights are 12V anyway; JetLites just stick a little more juice in them for
    brightness. I don't ride trails--just commuting. I wouldn't mind the extra running time. I'll let
    you know how it goes.
     
  9. <[email protected]> wrote in message news:[email protected]...
    > I've used my dual beam Jet Lites for 3 seasons and it's seems the batteries are kaput. I
    > charged them up the other day and the battery was warm as they usually are after charging but
    > no lights. I only use them during Daylight Saving Time so they've been sitting around for
    > several months. Anyway, a new battery pack from them will cost me $150 which seems ridiculous.
    > I took the pack apart and it seems pretty simple to do. It's 11 NiMH batteries wired in series.
    > It's 13.2V total so 1.2V per battery at 350mAh each (3800mAh total). I'd like to just replace
    > the batteries but most premade packs are underpowered compared to these. Would I need to get a
    > whole new charger for less volts? If I switched to lead acid or NiCd, would I need a new
    > charger, too?

    Check out: http://www.batterystore.com/battery_rebuilds.htm

    4500 mAH NiMH C cells are $4.50 each. Not sure how much they charge for the welding. This would
    yield a 59WH pack. Can't imagine they'd charge for than $40 or so for labor, but who knows?

    You could buy two 6 C cell battey holders and not weld the batteries together (use one dummy cell),
    but the shape would not be what you need, and it would be less reliable than welding.

    http://www.minute-man.com/acatalog/C_Cell_Holders.html

    Solder the lugs very carefully to not melt the plastic, and use heavy enough gauge wire for your
    lights (the tiny holes in the solder tabs don't accept large enough gauge wire, they need to be
    carefully enlarged).

    Do not try to use AA cells, they cannot handle that much current (don't go over a 1A discharge
    rate). You could parallel AA NiMH packs to solve the discharge rate issue, but you have to charge
    the packs serially, which is a hassle. But AA cells are amazingly inexpensive, you can get a pack of
    10 2000mAH cells for less than $9.

    Lead Acid would work if you don't mind the extra weight. Remember that while a 60WH SLA is only
    about $11, you'll actually need the 84WH SLA to about equal the 50 WH NiMH capacity of your old
    pack. SLA battery AH ratings are for a 20 hour discharge rate, at high discharge rates the capacity
    is drastically reduced. You'll need a a new charger, but SLA chargers are cheap. Check out
    http://zbattery.com for SLA batteries and chargers.

    See my web site for more details on batteries and chargers: http://bicyclelighting.com.

    Steve http://bicyclelighting.com
     
  10. Arpit

    Arpit Guest

    get the 4/3 aa batteries with solder tags

    On Sat, 11 Oct 2003 11:33:22 GMT, "Steven M. Scharf" <[email protected]> wrote:

    ><[email protected]> wrote in message news:[email protected]...
    >> I've used my dual beam Jet Lites for 3 seasons and it's seems the batteries are kaput. I
    >> charged them up the other day and the battery was warm as they usually are after charging but
    >> no lights. I only use them during Daylight Saving Time so they've been sitting around for
    >> several months. Anyway, a new battery pack from them will cost me $150 which seems ridiculous.
    >> I took the pack apart and it seems pretty simple to do. It's 11 NiMH batteries wired in
    >> series. It's 13.2V total so 1.2V per battery at 350mAh each (3800mAh total). I'd like to just
    >> replace the batteries but most premade packs are underpowered compared to these. Would I need
    >> to get a whole new charger for less volts? If I switched to lead acid or NiCd, would I need a
    >> new charger, too?
    >
    >Check out: http://www.batterystore.com/battery_rebuilds.htm
    >
    >4500 mAH NiMH C cells are $4.50 each. Not sure how much they charge for the welding. This would
    >yield a 59WH pack. Can't imagine they'd charge for than $40 or so for labor, but who knows?
    >
    >You could buy two 6 C cell battey holders and not weld the batteries together (use one dummy cell),
    >but the shape would not be what you need, and it would be less reliable than welding.
    >
    >http://www.minute-man.com/acatalog/C_Cell_Holders.html
    >
    >Solder the lugs very carefully to not melt the plastic, and use heavy enough gauge wire for your
    >lights (the tiny holes in the solder tabs don't accept large enough gauge wire, they need to be
    >carefully enlarged).
    >
    >Do not try to use AA cells, they cannot handle that much current (don't go over a 1A discharge
    >rate). You could parallel AA NiMH packs to solve the discharge rate issue, but you have to charge
    >the packs serially, which is a hassle. But AA cells are amazingly inexpensive, you can get a pack
    >of 10 2000mAH cells for less than $9.
    >
    >Lead Acid would work if you don't mind the extra weight. Remember that while a 60WH SLA is only
    >about $11, you'll actually need the 84WH SLA to about equal the 50 WH NiMH capacity of your old
    >pack. SLA battery AH ratings are for a 20 hour discharge rate, at high discharge rates the capacity
    >is drastically reduced. You'll need a a new charger, but SLA chargers are cheap. Check out
    >http://zbattery.com for SLA batteries and chargers.
    >
    >See my web site for more details on batteries and chargers: http://bicyclelighting.com.
    >
    >Steve http://bicyclelighting.com
     
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