SDS100: **SAFETY ALERT** SDS100 original (thin) battery severely swelled

spikestabber

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Has anyone made a battery bypass for this thing yet? My original 'fat' battery puffed over a year ago and I've been running without it ever since, however silly me threw the old pack away without first harvesting the BMS circuit, I would have simply used a supercapacitor duo to simulate a battery pack so the sdcard playback actually works, and it might keep the scanner up long enough to power off gracefully as the voltage drops.
 

spikestabber

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Why? I don't even need it, and given it spends time in the car, the summer heat kills the pack in 6 months or less from what I see in this thread, worthless for $100, might as well trick the device into thinking it has one!
 

JoeBearcat

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General charging tip: Do not leave the battery on charge after it is charged.
This will accelerate the demise of the pack/cell regardless of cell chemistry.
Also do not let the cell/pack run down completely.
 

darkness975

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General charging tip: Do not leave the battery on charge after it is charged.
This will accelerate the demise of the pack/cell regardless of cell chemistry.
Also do not let the cell/pack run down completely.
What about in the scanner itself? I leave mine plugged in and it turns green.
 

JoeBearcat

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Charging in the scanner on the SDS100 is not as bad as it was on older models (the SDS100 charger is a smart charger), but I recommend an external charger if you have more than one battery pack.
 

darkness975

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Charging in the scanner on the SDS100 is not as bad as it was on older models (the SDS100 charger is a smart charger), but I recommend an external charger if you have more than one battery pack.
I only have one battery for now. I've been unplugging it when it turns green and I don't have it charge when it's on running.
 

Ubbe

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I would have simply used a supercapacitor duo to simulate a battery pack so the sdcard playback actually works
I would also like to do the same. How are the battery detection designed so that it knows that there's a battery in place? Maybe it just needs a bleeding resistor to draw some current and then a standard El-lyt capacitor to hold enough power to let the scanner finish its write to the SD card. Maybe it's easier to buy some cheap very small Lipo cells that will fit in the case and use at home when there's external power available? But they need to be able to handle a 500mA charge current.

/Ubbe
 

JoeBearcat

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As long as the supercap is strong enough to last through a power-down cycle with writing the SD card...

That is the reason for the battery requirement - to prevent SD card corruption.

I don't know how it is detected, but I would guess it's voltage sensing from the battery terminals.
 

Ubbe

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That is the reason for the battery requirement - to prevent SD card corruption.
How is that solved in the BCD536HP and SDS200 when used in a vehicle where the voltage fluctuates a lot when you start the engine or the power plug makes its way out of the cig plug connector?

Logically it should be the exact same risk of corrupt SD cards regardless of scanner type and there's no real reason to inhibit SD card recording on the portables when used without internal battery. Does the BCD536/SDS200 have an internal battery backup? No, but they actually would need it to keep them powered for 10 seconds at a power failure.

/Ubbe
 

Ubbe

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The replay buffer has a 240 sec maximum that will require 4MB of memory. That buffer are using the SD card memory, adding wear and tear. Surely there has to be a spare 4MB RAM somewhere to be reserved for that use. Then it would also be technically possible to use replay at the same time as user recording.

/Ubbe
 

JoeBearcat

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How is that solved in the BCD536HP and SDS200 when used in a vehicle where the voltage fluctuates a lot when you start the engine or the power plug makes its way out of the cig plug connector?

Logically it should be the exact same risk of corrupt SD cards regardless of scanner type and there's no real reason to inhibit SD card recording on the portables when used without internal battery. Does the BCD536/SDS200 have an internal battery backup? No, but they actually would need it to keep them powered for 10 seconds at a power failure.

/Ubbe
When you are starting the car, the scanner is probably not fully powered on, and is not in RECORD mode.

Otherwise, it is not 'solved'. That is why it is recommended to use the power control on the scanner rather than relying on ignition power.
 
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