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Ben Kim

60 mile Review Veteran Sherman

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11 minutes ago, Bridgeboy said:

Mine says LK1158 in Bluetooth connections. Does that tell us anything meaningful? Does that literally mean its the 1,158th manufactured?

I also just ordered the 8V "smart" rapid charger from eWheels. I'm wondering if charging the wheel with that, with its intelligent circuitry might "fix" the batteries to charge to 100%. I guess I'll see...

yeah, tells you how many Shermans (approximately) veteran has sold!

The eWheels charger is overpriced, I got this one instead:

https://www.pmbatterychargers.com/900W-1008V-5A-7A-9A-current-adjustable-digital-display-partial-charge-lithium-li-ion-battery-charger-for-100V-gotway-free-shipping-p2579895.html

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15 minutes ago, Bridgeboy said:

I also just ordered the 8V "smart" rapid charger from eWheels. I'm wondering if charging the wheel with that, with its intelligent circuitry might "fix" the batteries to charge to 100%. I guess I'll see...

You are over thinking this. There’s no fix to be had. You are at 100% in all relevant terms..

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@Ben Kim

Did you get the pictured charger (jr-b900) or the one that is a double decker of the 5A type Veteran is using? Just wondering as they seem to ship random versions.

(Thanks for the info about the LKxx Bluetooth name, I thought it might be that, mine is LK52)

Edited by null

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2 hours ago, null said:

@Ben Kim

Did you get the pictured charger (jr-b900) or the one that is a double decker of the 5A type Veteran is using? Just wondering as they seem to ship random versions.

(Thanks for the info about the LKxx Bluetooth name, I thought it might be that, mine is LK52)

well that’s the one i ordered. I haven’t received it yet :( damn Chinese holidays. 

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4 hours ago, Ben Kim said:

yeah, tells you how many Shermans (approximately) veteran has sold!

The eWheels charger is overpriced, I got this one instead:

https://www.pmbatterychargers.com/900W-1008V-5A-7A-9A-current-adjustable-digital-display-partial-charge-lithium-li-ion-battery-charger-for-100V-gotway-free-shipping-p2579895.html

It's my understanding that any single charge port on the Sherman is max rated for 8A , and the entire Sherman is rated for max 10A using both ports.

So, I would not use the 9A option on that charger or you may risk damage. Better stick to 7A.

 

 

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4 hours ago, Mrd777 said:

You are over thinking this. There’s no fix to be had. You are at 100% in all relevant terms..

Well I'm just just basing this on experience with other rechargeable batteries I've had (like AAs). I've had dead ones, and poorly performing ones, and after I put them on a high quality smart charger the algorithm inside the circuit repaired them and brought them back to life.

I don't know how it works, but I just know that it does. I don't know if that will translate into my Sherman eventually getting 100% or not, but I get your point, it's splitting hairs. I've just never had an EUC that didn't register a full 100% before (I have six of them) so it makes me worried something isn't quite right, like a bad cell in one of the batteries or something.

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5 hours ago, Bridgeboy said:

It's my understanding that any single charge port on the Sherman is max rated for 8A , and the entire Sherman is rated for max 10A using both ports.

So, I would not use the 9A option on that charger or you may risk damage. Better stick to 7A.

 

 

no i will create a reverse splitter that can distribute the 9A across both ports (making it a very safe 4.5A per port) 

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14 hours ago, Ben Kim said:

yeah, tells you how many Shermans (approximately) veteran has sold!

The eWheels charger is overpriced, I got this one instead:

https://www.pmbatterychargers.com/900W-1008V-5A-7A-9A-current-adjustable-digital-display-partial-charge-lithium-li-ion-battery-charger-for-100V-gotway-free-shipping-p2579895.html

 

IMG_20201012_091207.jpg

IMG_20201012_091212.jpg

IMG_20201012_091202.jpg

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On 10/12/2020 at 10:49 AM, Ben Kim said:

well that’s the one i ordered. I haven’t received it yet :( damn Chinese holidays. 

You would love this charger ...the quality is really good.... 

I took some photos of that charger, been using it to charge my MSX and MSP, and waiting for Sherman next month or so :)

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On 10/13/2020 at 8:34 AM, Marty Backe said:

I use EUC World, but when I care, I read the voltage direct from the LCD display. I wouldn't worry about the voltage. They don't use high tolerance components for their analog to digital converters so there can easily be a 1% or greater variance in reported voltage. My Sherman "only" charges to 99.8-volts and I'm happy.

I see that Darknessbot reports a totally different firmware version than EUC World. I have no idea which is which.

 

On 10/11/2020 at 6:14 PM, Bridgeboy said:

Well I'm just just basing this on experience with other rechargeable batteries I've had (like AAs). I've had dead ones, and poorly performing ones, and after I put them on a high quality smart charger the algorithm inside the circuit repaired them and brought them back to life.

I don't know how it works, but I just know that it does. I don't know if that will translate into my Sherman eventually getting 100% or not, but I get your point, it's splitting hairs. I've just never had an EUC that didn't register a full 100% before (I have six of them) so it makes me worried something isn't quite right, like a bad cell in one of the batteries or something.

I now think the variations in battery charge level are charger related. I received the 8A rapid charger from eWheels with hopes that it might "fix" the batteries and get to 100% but something completely unexpected happened: It only got to 95% and 99v before turning off.

I tried resetting the charger it but it would  not turn back on and charge the wheel any more; as far as it was concerned it was done. It's algorithm thought the wheel was at 100% I guess and stopped flowing amps.

So I unplugged that charger and plugged in the OEM 5A charger and it started charging and it brought the batteries all the way back to the previous 98% and 100.20v.

So, I don't think it's variations in the batteries in the wheel as much as I think it's the circuitry/algorithms inside the smart chargers telling them when to turn off.

These chargers must get confused with such a large battery pack I guess?

 

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26 minutes ago, Bridgeboy said:

 

I now think the variations in battery charge level are charger related. I received the 8A rapid charger from eWheels with hopes that it might "fix" the batteries and get to 100% but something completely unexpected happened: It only got to 95% and 99v before turning off.

I tried resetting the charger it but it would  not turn back on and charge the wheel any more; as far as it was concerned it was done. It's algorithm thought the wheel was at 100% I guess and stopped flowing amps.

So I unplugged that charger and plugged in the OEM 5A charger and it started charging and it brought the batteries all the way back to the previous 98% and 100.20v.

So, I don't think it's variations in the batteries in the wheel as much as I think it's the circuitry/algorithms inside the smart chargers telling them when to turn off.

These chargers must get confused with such a large battery pack I guess?

 

Funny thing happened to my older MSX that I added 615wh extra battery always read 100.2V with my either 2.8 or 3A charger ...but then I used for first time this fast charger filled out up to only 90% then switched to 2.8A charger and it now reads 100.8V

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30 minutes ago, Steve Jo said:

Funny thing happened to my older MSX that I added 615wh extra battery always read 100.2V with my either 2.8 or 3A charger ...but then I used for first time this fast charger filled out up to only 90% then switched to 2.8A charger and it now reads 100.8V

You didn't have it set to 90% did you? They have a knob on them to charge to 80%, 90%, or 100%.

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i did it on purpose to recharge til 90% only then i slow charge it with 2.8A til full 

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13 hours ago, Steve Jo said:

Funny thing happened to my older MSX that I added 615wh extra battery always read 100.2V with my either 2.8 or 3A charger ...but then I used for first time this fast charger filled out up to only 90% then switched to 2.8A charger and it now reads 100.8V

This is a variant of the old eWheels fast charger, i wouldn’t be at all surprised if it doesn’t do a full 100.8V charge; the CV is a little short on this particular charger. The stock YZpower chargers (both 3 and 5A) do a proper CV. 

However both my little splitter with circuit tester and the charger itself confirmed it can spit out a legit 9A. 

 

edit- confirmed.  Let my Sherman charge overnight @ 5A, resting voltage is 100.1V.  It has a nice side effect of shutting my sherman off when the charger is done too (don't know why).  At the higher amp settings, the final resting voltage will be even lower.  Let's just hope its a bit more reliable than the old ewheels chargers which tended to break or drift pretty easily.  

Edited by Ben Kim

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