Search found 366 matches

by imorton
Sep 26, 2017 7:05 am
Forum: Battery Technology
Topic: Battery Space 20AH Prismatic LiFePO4 tests
Replies: 66
Views: 8032

Re: Battery Space 20AH Prismatic LiFePO4 tests

Wow, thanks for the update.

Looks like these are very suitable batteries for a scooter that needs 20-30a draw.

Thanks again, IAN.

PS: sorry to hear about your rain soaked (extremely drained) batteries... :(
by imorton
Jul 16, 2017 11:51 pm
Forum: Battery Technology
Topic: Gaozhao Charger Investigated (non-OEM from China)
Replies: 29
Views: 2661

Re: Gaozhao Charger Investigated (non-OEM from China)

Oh, for the one that asked many times if to connect the charger or the battery first, always connect the charger first. Connecting the battery first will offer an extra surge load to the charger when connected to power and on the other hand, you would be connecting an temporarily unstable source to...
by imorton
Jul 11, 2016 12:39 pm
Forum: Battery Technology
Topic: Is my 48v 15Ah LifePo4 battery (from Sun-Thing) healthy?
Replies: 10
Views: 1019

Re: Is my 48v 15Ah LifePo4 battery (from Sun-Thing) healthy?

Normally, I'd say charge daily, but since your trips are that short, It could result in a longer lifespan to charge only when you need to. Not weeks, but certainly you could get by with charging only one time a week. That's 10k of riding. Ideally, have the pack sit around 100% full as short a time ...
by imorton
Jul 10, 2016 9:10 am
Forum: Battery Technology
Topic: Is my 48v 15Ah LifePo4 battery (from Sun-Thing) healthy?
Replies: 10
Views: 1019

Re: Is my 48v 15Ah LifePo4 battery (from Sun-Thing) healthy?

It IS a lot of sag. But that's fairly typical for the inexpensive lifepo4 pouches. And the use is a bit harsh, at least relative to a lighter rider on a bicycle, who pedals to help an amps worth. Two solutions possible for your next battery,, One would be a much higher c rate pack. But I'm not sure...
by imorton
Jul 10, 2016 8:46 am
Forum: Battery Technology
Topic: Is my 48v 15Ah LifePo4 battery (from Sun-Thing) healthy?
Replies: 10
Views: 1019

Re: Is my 48v 15Ah LifePo4 battery (from Sun-Thing) healthy?

Yep I mainly use A123 but was comparing a cheap pack I've got here. The A123s are able to tolerate abuse beyond normalcy but the cheaper stuff still lasts :D As you say you have to weigh all the facets for yourself and you listed several good reasons to choose LiFe. The battery is the heart of syst...
by imorton
Jul 09, 2016 3:37 pm
Forum: Battery Technology
Topic: Is my 48v 15Ah LifePo4 battery (from Sun-Thing) healthy?
Replies: 10
Views: 1019

Re: Is my 48v 15Ah LifePo4 battery (from Sun-Thing) healthy?

Number seem typical for generic LiFePO4. For comparison I've got a few year old generic 48V LiFePO4 pack that had a bum BMS, corrosion and 1-2 bad cells when I got it. The remaining 14 cells all had 95-98% of original capacity. The internal resistance (as seen in your voltage drop under load) is mu...
by imorton
Jul 09, 2016 3:26 pm
Forum: Battery Technology
Topic: Is my 48v 15Ah LifePo4 battery (from Sun-Thing) healthy?
Replies: 10
Views: 1019

Re: Is my 48v 15Ah LifePo4 battery (from Sun-Thing) healthy?

Dogman, thanks a lot for your reply and basically a confirmation of the thoughts that I was having. I also thought that 59.9v (or basically 60v charging) was a little high, but it appears that all the chargers that come from SunThing are at 60v. Is it easy to open up those chargers and adjust them d...
by imorton
Jul 08, 2016 9:58 am
Forum: Battery Technology
Topic: Is my 48v 15Ah LifePo4 battery (from Sun-Thing) healthy?
Replies: 10
Views: 1019

Is my 48v 15Ah LifePo4 battery (from Sun-Thing) healthy?

Hi Guys & Girls, I have a scooter and had SLA's and when it was time to change them, I bought a 48v 15Ah LifePo4 16s battery from Sun Thing @ 2 years ago. I tested it at the beginning and it produced @ 14.5 Ah and seems to balance fairly quickly. My average trips are @ 6-10 kms, and have done a few ...
by imorton
Mar 08, 2016 8:53 am
Forum: E-Bike Reviews & Testing
Topic: K Battery, on Alibaba.
Replies: 14
Views: 4026

Re: K Battery, on Alibaba.

Thanks for the updates, it's always good to know how much AND how long these batteries "put out"....

Quality is quality, and cheap is usually cheap.

Atlas you are getting some use out of it, and it just didn't die on you... :)

IAN.
by imorton
Aug 28, 2015 7:20 am
Forum: Battery Technology
Topic: Max discharge rate/time
Replies: 17
Views: 675

Re: Max discharge rate/time

Dogman Dan, Lol, I am not a electrical engineer, but having a battery fly 20ft and breaking the battery box could very likely cause some swelling... :) IAN. PS: so having the battery discharge at a constant 1C, and the occasional 1.6C for those hills will not likely cause any premature death. And ev...
by imorton
Aug 28, 2015 7:02 am
Forum: Battery Technology
Topic: Max discharge rate/time
Replies: 17
Views: 675

Re: Max discharge rate/time

Dogman Dan, I agree with what you say and I find that the scooter draws @ 400 watts (8amps) at 20km/h, and it draws @ 800watts (16amps) at WOT throttle of 31km/h. What is amazing that a 50% increase in speed requires double (or 100% increase) the power. I have been babying the discharge rate, so I g...
by imorton
Aug 28, 2015 1:59 am
Forum: Battery Technology
Topic: Max discharge rate/time
Replies: 17
Views: 675

Re: Max discharge rate/time

The scooter had four 12v x 12ah lead batteries. They were giving me @ 6-7ah of useable capacity, so the 15ah LifePo4 gives me @ double the capacity. I actually sold my lead batteries to another guy who owned a scooter, and used the $100 towards the new battery pack. Needless to say, I am very please...
by imorton
Aug 27, 2015 9:43 pm
Forum: Battery Technology
Topic: Max discharge rate/time
Replies: 17
Views: 675

Re: Max discharge rate/time

Wesnewell, If I get 5 years out of my LifePo4 battery, I will be really pleased... :) I guess I was worried that running a 15ah LifePo4 pouch battery at 1.6C while running up a long hill for 60-120 seconds might harm the battery. I can see that my battery appears healthy as it's resting voltage is @...
by imorton
Aug 27, 2015 11:49 am
Forum: Battery Technology
Topic: Max discharge rate/time
Replies: 17
Views: 675

Re: Max discharge rate/time

Wesnewell, thanks for the reply.

What do you think is the calendar life of a 48v 15Ah LifePo4 battery pack? I don't think I will wear it out by exceeding the cycle life, but what is the average amount of years before a "calendar life" LifePo4 death...?

IAN.
by imorton
Aug 27, 2015 9:02 am
Forum: Battery Technology
Topic: Max discharge rate/time
Replies: 17
Views: 675

Re: Max discharge rate/time

you have to avoid being drawn into the my battery is better than yours put downs. nothing wrong with your sun-thing guy pack. it will last plenty long if you try discharging a lithium pack while it is super cold then you end up precipitating out the lithium away from the carbon electrode and that l...
by imorton
Aug 27, 2015 8:14 am
Forum: Battery Technology
Topic: Max discharge rate/time
Replies: 17
Views: 675

Re: Max discharge rate/time

wow, pretty low spec batt. 24A for a 15H pack should be no sweat. a similar capacity pack from EM3EV would deliver 40A no problem - 29E packs warm up in both frame packs (11.6AH 48V) and triangle packs ~16AH when pulling 40A but at 24A they barely rise in temp at all. 20R/25R packs dont even break ...
by imorton
Aug 27, 2015 8:09 am
Forum: Battery Technology
Topic: Max discharge rate/time
Replies: 17
Views: 675

Re: Max discharge rate/time

if the battery is still fully charged it (2C-4C) is not a problem but if the battery is almost discharged try to reduce the C rate of the current draw. especially if it has labored for a long period previous and was already getting hot. high discharge at low state of charge creates a lot more heat ...
by imorton
Aug 27, 2015 6:46 am
Forum: Battery Technology
Topic: Max discharge rate/time
Replies: 17
Views: 675

Max discharge rate/time

Good day, I wonder if anyone can tell me the max CONTINUOUS discharge rate for the 48v 15Ah LifePo4 battery from eBay (sun thing-28) Here is the specs/details about the battery http://www.ebay.com/itm/48v-15ah-LiFePO4-Battery-5A-Charger-BMS-For-Ebike-Kits-Powerful-USE-700W-800W-/131551924820 I hear ...
by imorton
Aug 06, 2015 12:33 pm
Forum: Battery Technology
Topic: LIFEPO4 pack:right/wrong way to charge for longevity?
Replies: 21
Views: 1328

Re: LIFEPO4 pack:right/wrong way to charge for longevity?

Kiriakos GR wrote:I have 10Ah 38120L LiFePO4 Headway Battery Pack (with BMS)


I bet 1000 EUR that I will get those numbers. 8)

You should never bet, with a battery.... They usually win :)
by imorton
Aug 06, 2015 6:33 am
Forum: Battery Technology
Topic: LIFEPO4 pack:right/wrong way to charge for longevity?
Replies: 21
Views: 1328

Re: LIFEPO4 pack:right/wrong way to charge for longevity?

Dogman Dan, what an awesome explanation, thanks a million... :)

There's a lot of little things to remember, but if it keeps the battery healthy, that's what counts.

IAN.
by imorton
Aug 06, 2015 4:58 am
Forum: Battery Technology
Topic: LIFEPO4 pack:right/wrong way to charge for longevity?
Replies: 21
Views: 1328

Re: LIFEPO4 pack:right/wrong way to charge for longevity?

SOC is state of charge

DOD is Depth of Discharge
by imorton
Aug 06, 2015 4:57 am
Forum: Battery Technology
Topic: LIFEPO4 pack:right/wrong way to charge for longevity?
Replies: 21
Views: 1328

Re: LIFEPO4 pack:right/wrong way to charge for longevity?

I guess the difficulty I have is how to only charge to 80% of charge with a regular elcheapo 3amp charger. And it is not practical to only charge before using the scooter, since I use it almost everyday. Sometimes I finish using it at 6pm for the day, throw it on the charger till the green light com...
by imorton
Aug 06, 2015 12:02 am
Forum: Battery Technology
Topic: LIFEPO4 pack:right/wrong way to charge for longevity?
Replies: 21
Views: 1328

Re: LIFEPO4 pack:right/wrong way to charge for longevity?

I am curious too, as I have a SunThing 48v 15Ah LifePo4 battery.

Often I only use 2ah per day, and I end up leaving the 3amp charger on overnight... Am I losing longevity, or is it not making any difference, or is it doing good by always being charged & balanced for the next days usage?

IAN.
by imorton
Aug 04, 2015 6:50 pm
Forum: E-Scooter and Motorcycle General Discussion
Topic: Video: 70kph, 150km range, German e-scooters for Montreal
Replies: 11
Views: 1261

Re: Video: 70kph, 150km range, German e-scooters for Montrea

granolaboy wrote:100km range with a 30ah battery eh?

ya, right.

That's 15Wh/km... Maybe going 9km/h with a 140 lb rider weight, ideal temp, no wind, flat road, no stops, etc.... in other words, on some dyno somewhere... lol
by imorton
Aug 04, 2015 5:35 pm
Forum: E-Scooter and Motorcycle General Discussion
Topic: Video: 70kph, 150km range, German e-scooters for Montreal
Replies: 11
Views: 1261

Re: Video: 70kph, 150km range, German e-scooters for Montrea

With 3 batteries, its almost 7,000 dollars.... :) Base price is @ 4,299.. wow... At that price, it should make coffee, and preferably Tim Horton's coffee... :) I'll stick with my 2013 Gio Italia, 48v, 32kmh for $799 cad. I bought a 48v 15Ah LifePo4 pack for $350 usd delivered, and have more than eno...