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Thread: BU-303 ! I have found the problem for all!

  1. #21
    See me in my wet t-shirt. stevieg's Avatar
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    I have suspected something like this for a long time...

    I found that if the BU303 is left for a few weeks it took me ages to get the satellites to lock, until days and days after hooking it back up - and it had reset from SIRF or whatever back to NMEA 4800.

    I just figured the battery needed time to warm up.. I'll be trying this for sure though!
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  2. #22
    Clover Grayscale's Avatar
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    Quote Originally Posted by westscape
    Well last time I looked I was sure the "battery" inside the BU-303 is not a battery but is actually a super capacitor. Not sure what soldering a battery in would have though!
    I'm almost positive it's a battery, not a capacitor. Anyone wanna back me up on this?
    CarPC install is starting to come along again...

  3. #23
    mox
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    I popped open my BU-303 to check out this "watch battery". Actually it is NOT a battery, but a 0.22F capacitor ("SuperCap"). Think of a supercap as a small rechargeable battery with a very short charging time. Replacing it by a non-rechargeable kind of (watch-)battery is definitely a bad idea.

    Older BU-303s are known to contain badly soldered or otherwise badly mounted supercaps which come loose due to a car's vibration. This might be an explanation for the problems you guys are having.

    Should the BU-303 have contained a regular battery, the manufacturer would have mentioned so, or would at least have made it user serviceable.

    - Erwin

  4. #24
    Clover Grayscale's Avatar
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    Interesting. So I didn't know capacitors started going bad like that. Any insight on where to get one? I don't think I need one, since I still have my old one, I'm just asking for anyone else. Mouser.com or Digi-key.com? I just searched and it looks like they have some specifically labeled "super backup capacitors" that have the specs we need for a minimum of 1500.

    Mox (or anybody) would a typical .22F electrolitic cap with a max voltage rating of like 35 work?
    CarPC install is starting to come along again...

  5. #25
    MySQL Error Scouse Monkey's Avatar
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    Quote Originally Posted by Grayscale
    Interesting. So I didn't know capacitors started going bad like that. Any insight on where to get one? I don't think I need one, since I still have my old one, I'm just asking for anyone else. Mouser.com or Digi-key.com? I just searched and it looks like they have some specifically labeled "super backup capacitors" that have the specs we need for a minimum of 1500.

    Mox (or anybody) would a typical .22F electrolitic cap with a max voltage rating of like 35 work?
    Yeah caps can die with a lot of use - especially high capacity ones like that.

  6. #26
    mox
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    I guess so, but don't expect to find a .22F/35V capacitor that will fit. Remember, .22F is 220,000 microfarad!

  7. #27
    Clover Grayscale's Avatar
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    Quote Originally Posted by mox
    Remember, .22F is 220,000 microfarad!
    I know, it took me a sec to figure out why you were calling it a supercap and then I was like OH, its not 22uF! Well I guess I'm safe for now. So putting a watch battery in would be bad...hmmmm. I will have to test out if putting my "SuperCap" back in will make my GPS lock faster.
    CarPC install is starting to come along again...

  8. #28
    Constant Bitrate naveedh's Avatar
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    ok looking on this advice, my Rikaline 6010 started playing up as well. So i thought i open it up and had a look and it is a battery. If you search for PCB mounted batteries you will find what your looking for, i have. The price i found was $4.

    The Rikaline Has a Battery not a supercap.

  9. #29
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    Couldnt you just use a 12v to 3.3 LDO regulator from the car battery to where the cap went. Then you would always get a quick satalite lock.

    Of course you would need a diode on the output so the gps doesnt try and charge it.

    Obviously you would have to look at the circuit to see if its possible, but its an idea

  10. #30
    Constant Bitrate Goddy's Avatar
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    To avoid all these bu303 problems (there are also problems with this gps unit in combination with lcd-screens) are there any good alternatives? I have the bu303 too and i have to put the unit on the airbagunit (it has a metal underground) so the lcd wont interfer with the gps unit (i have tried all Hz', none working fine).

    Is the Rikaline a good alternative?

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