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#51

karelian65
Member
Joined: 16 January 2017
Posts: 97
Member
01 September 2019 04:54 pm

Thanks to XLOOX I now have a 16volt plus battery holder, that is 4 x 18650 cells for 16.48 volts, perfect for the Tdi SL. A quick test to see if it was all worth it, just to see what gains were on offer. Using the SL Limited Ed, with the Super Pulse 220 coil there was some improvement. Started with the Ukrainian 3 x 18650 pack which came in at 12.38 volts, compared to the modified pack with 4 x 18650 cells at 16.48 volts. Then compared those results with ones from a Tdi Pro using the same coil.1567316915_img_1290_2_edited.jpg1567316932_img_1300_2_edited.jpg

Tdi Sl with gain at max, GB off, Pulse Delay at 10, in all frequency middle. Using Super Pulse 220 coil,

12.38 volts gave 6cm on a 1 grain ingot, 24cm on 0.5 gram gold coin, 32cm on gold Half Sovereign and 27cm on a US Quarter.
16.48 volst gave 8cm on a 1 grain ingot, 26cm on 0.5 gram gold coin, 35cm on gold Half Sovereign and 30cm on a US Quarter.
Tdi Pro gave 8cm on a 1 grain ingot, 27cm on 0.5 gram gold coin, 36cm on gold Half Sovereign and 33cm on a US Quarter.

The Tdi SL was on MAX gain, the Tdi Pro gain was set a 5.

All the best,
Karelian

#52

Rustynails
Member
Joined: 20 May 2019
Posts: 54
Member
01 September 2019 06:38 pm

Excellent review as usual Karelian.
So it seems that the extra voltage gives approximately 10% depth improvement, but that may not be be the main advantage. When the 4 cell pack fades to 3.1v per cell it will equal the 3 cell pack with fully charged batteries. When the 3 cell pack fades to 3.1v per cell the SL will be running at 9.3 volts. I’ve read reports claiming that the SL suffers noticeably by the time disposables hit the wall at 8.5 volts.
Food for thought.


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