40T vs 50E batteries?

[360rumors]

As you know, ewheels has been offering Samsung 40T batteries for newer Begode wheels such as T4 and MTen4. Ewheels says that the nominal capacity is lower but the range difference is less than 5%. Does anyone have experience with the 40T batteries? Is the range really almost as good as 50E?

Edited August 23, 2022 by 360rumors

[jcfp]

FWIW, on a KS22... Wrong Way got 10% less range, going 10% slower, with a street tire/40T combo vs knobby/standard battery combo in his range test (time stamped start...) 

 

[360rumors]

2 minutes ago, jcfp said:

FWIW, on a KS22... Wrong Way got 10% less range, going 10% slower, with a street tire/40T combo vs knobby/standard battery combo in his range test (time stamped start...) 

 

Thanks this was very helpful!

[alcatraz]

The more amps you pull the smaller the range difference. So larger packs = 50E. Smaller packs = 40T. 

But most importantly, safety, follows the same rule.

[360rumors]

1 minute ago, alcatraz said:

The more amps you pull the smaller the range difference. So larger packs = 50E. Smaller packs = 40T. 

But most importantly, safety, follows the same rule.

I’m only worried about whether the 50e is more likely to combust. I read that ewheels’ hypothesis is that begode equipment pushes the batteries harder and that’s what is making them more likely to start a fire.  Since 40T can be pushed harder, does that make it a safer choice (less likely to burn) for Begode wheels?

[alcatraz]

That's true. But running 50E cells in a Sherman Max is not riskier than 40T in lets say an RS.

It is possible to sweat the 40T cells. It's just less likely. And putting them in large packs where the current never really goes high (per cell) is pretty pointless.

[houseofjob]

2 hours ago, 360rumors said:

I’m only worried about whether the 50e is more likely to combust. I read that ewheels’ hypothesis is that begode equipment pushes the batteries harder and that’s what is making them more likely to start a fire.  Since 40T can be pushed harder, does that make it a safer choice (less likely to burn) for Begode wheels?

The fire cells you speak of (spec sheet & some sites/dealers say M50T, others say M50LT), they are a unique scenario IMHO when reading the great Mooch Vape cell test report for this cell. In the test report, Mooch says that this cell literally starts to decline in max amp discharge capacity starting at 25 Celsius and going hotter, which is way too low a temp threshold for EUC, considering how our EUC packs are shrink wrapped and crowded together amassing heat, especially in the extremes of summer under aggressive riding amp loads, not to mention older model Gotways have poor heat escape to begin with, and undersized heatsinks with not great thermal conduction from FET to heat pad.

I've said it before, and will say it again: this cell should never have been used in high performance PEVs like EUCs, esp. used in packs 4P and under is like a crime (I'm sure it's great when said cell is used within it's intended conditions and amp loads).

Never in my 7 years of EUC riding do I remember a sole lithium battery cell choice being the main cause of so many thermal runaway incidents, it's not even close, such specific-cell-dependent incidents are way rare if you throw out these M50 cases.

 

On the flip side, if you read the Mooch reports of the 50E batch 2 and 40T batch 3, you'll see that they do not underperform at such low temp thresholds, they're way higher temp thresholds. 

That said, if it were me, I would pick the 40T's, always picking the higher amp cell when the pack is 4P or lower, due to voltage sag / easier overpower esp at the bottom of the battery capacity. 40T after all, is one of the old goto cells for 21700 vaping, a world where they need all the performance they can get out of a single cell.

Edited August 24, 2022 by houseofjob