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White’s TDI Battery Modifications


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On 8/30/2018 at 4:40 PM, EL NINO77 said:

there's something to motivate - replacement battery pack li-ion 18650 and battery dimensions - so it will not be a problem to do 4x 18650, or 6X 18650 ... maybe even more ...2007937673_august4iphone5S033_DxO.jpg.a00de2ebcfc0d264ad97cca9c39753da.jpg

Is there anything that you can share on the details of getting the 16 volt battery configuration to fit in the TDI BH?  I have one that I just bought, and I have heard that I can pickup a few inches of detecting depth with the 14.8v vs. 12 v stock config, and maybe even more depth with the 16v config.  I would appreciate any details on whether you saw any harm to the electronics with this extra, applied battery voltage or not, the benefits of the higher voltages, and the needed case mods to make it fit?  Thanks kindly. Brittany.

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On 12/23/2021 at 11:25 AM, BeachBunnyTRHunter - DP said:

Is there anything that you can share on the details of getting the 16 volt battery configuration to fit in the TDI BH?  I have one that I just bought, and I have heard that I can pickup a few inches of detecting depth with the 14.8v vs. 12 v stock config, and maybe even more depth with the 16v config.  I would appreciate any details on whether you saw any harm to the electronics with this extra, applied battery voltage or not, the benefits of the higher voltages, and the needed case mods to make it fit?  Thanks kindly. Brittany.

I put up a huge list of links about making boosted battery packs for TDI. The benefit would be obvious - more depth. This other post best explains the possible downside…

 

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Boosted packs help, but everybody should be aware that Carl, the TDI SL designer, has stated that the SL will tolerate voltages to 22 volts, but if you're running above 20, you should swap some capacitors for higher voltage-rated caps. The SL does tolerate higher voltages than the standard TDI series, however.

Jim

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While the components can handle the higher voltage, Tony makes a good point in the other thread: be mindful of the extra heat generated. A lot of people have successfully run the SL at 14.4V but any higher than that requires some careful diagnostics before you call it done. Otherwise you could end up cooking the circuit.

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Carl, I've run mine as high as 16.8 without problems, but now limit the voltage to 16.0, just to be safe.

But, I've been thinking of a 5 cell battery pack limited to 20v. Might have to raise the wattage of R9 to dissipate any additional heat.

Jim

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R9 is one of the limitations to earlier sampling. If you want to kill 2 cats with 1 stone then raise the value of R9 to, say, 2.2k or maybe 3.3k. This will lower the power dissipation and speed up the diode clamp recovery. The trade-off is it also raises the thermal noise but the SL already runs pretty quiet so it may be acceptable. Unfortunately the SL sample delay is set by firmware so you would also need a solution for that.

 

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Many thanks, Carl. I'm not going to get into it that deep. I thought of raising the wattage of R9 because I've a read a complaint that it was getting hot with the raised battery voltage. I haven't seen it in mine, but thought it might start showing up if I went to 21 volts, as in a 5-cell pack.

Jim

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  • 2 weeks later...

TDI SL works pretty well at standard battery. I agree with Carl, back battery 3 cells at 12,6v. That is enough, right setting and right loop what makes difference.

All the best next spin. 

Hamid 

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