Search found 38 matches

by Valman
Jun 28 2019 4:15am
Forum: Battery Technology
Topic: Correct charge voltage for Samsung 35E
Replies: 7
Views: 629

Re: Correct charge voltage for Samsung 35E

Thanks Pajda, the 35E datasheet agrees with you entirely about charge current, it says 1020mA (0.3C) for best cycle life which is what I'll be doing. I have plenty of capacity overhead for my application, so for me I want to prolong the life of the pack as long as possible. I just read this article ...
by Valman
Jun 27 2019 5:29am
Forum: Battery Technology
Topic: things not to forget before heatshrinking my self made battery
Replies: 8
Views: 685

Re: things not to forget before heatshrinking my self made battery

Is there a single display that I can mount remotely from the battery that would show a 'fuel gauge' and battery temperature readout?
by Valman
Jun 27 2019 4:11am
Forum: Battery Technology
Topic: Correct charge voltage for Samsung 35E
Replies: 7
Views: 629

Re: Correct charge voltage for Samsung 35E

would charging just to 4.1v be better for lifespan than charging set to 4.2v?


I charge at 1.02A because datasheet says that's best for lifespan

thanks for the amazing quality of responses
by Valman
Jun 26 2019 2:21pm
Forum: Battery Technology
Topic: Correct charge voltage for Samsung 35E
Replies: 7
Views: 629

Re: Correct charge voltage for Samsung 35E

For LiIon I can adjust it as high as 4.15v but no higher. I wonder could there be any downside to me setting it to LiPo to get the 4.2v charge voltage I need?
by Valman
Jun 26 2019 1:52pm
Forum: Battery Technology
Topic: Charger Reccommendation Please?
Replies: 15
Views: 1084

Re: Charger Reccommendation Please?

Image Image

Just need to build a decent enclosure for it now
by Valman
Jun 26 2019 1:50pm
Forum: Battery Technology
Topic: Correct charge voltage for Samsung 35E
Replies: 7
Views: 629

Correct charge voltage for Samsung 35E

Hi, the datasheet for the 35e says charge voltage is 4.2v, but setting up my isdt t8 charger, it seems to say 4.1v for LiIon and 4.2v for LiPo. I thought the 35e was LiIon, even the datasheet says lithium ion, so why doesn't my charger not let me set LiIon to 4.2v? Is the 35e actually a Lipo? Thanks
by Valman
Jun 26 2019 4:27am
Forum: Battery Technology
Topic: First battery pack build, does my design look OK?
Replies: 3
Views: 476

Re: First battery pack build, does my design look OK?

Thanks very much for the advice. Yes, I got the nickel and plastic honeycomb cell parts from the polish kart company, very happy with their products. I'll solder on some thick gauge wire along the final negative and positive strips as you suggest - but other than that, should I be putting on more 'l...
by Valman
Jun 26 2019 1:20am
Forum: Battery Technology
Topic: Charger Reccommendation Please?
Replies: 15
Views: 1084

Re: Charger Reccommendation Please?

That psu is just to feed the isdt t8 dc to dc "proper" charger
by Valman
Jun 20 2019 2:33pm
Forum: Battery Technology
Topic: First battery pack build, does my design look OK?
Replies: 3
Views: 476

First battery pack build, does my design look OK?

Before I spot weld this bad boy up, I'd be hugely grateful for any advice, should you notice something 'wrong' 91x samsung 35e in 7s13p configuration, so a 24v system which will have a continuous load of around 13A, and a theoretical peak of 74a for 10 seconds which will probably never/rarely happen...
by Valman
Jun 20 2019 2:21pm
Forum: Battery Technology
Topic: What connector is this please?
Replies: 5
Views: 413

Re: What connector is this please?

Thanks so much to all for the huge quality in replies, extremely informative
by Valman
Jun 19 2019 1:14pm
Forum: Battery Technology
Topic: What connector is this please?
Replies: 5
Views: 413

What connector is this please?

I'm upgrading this mobility scooter to lithium, and thought it would be a good idea to keep stock connectors here in case it needs to be put back to stock (I will probably upgrade the awg of the wire from this connector back to the controller board) So, anyone know what this connector is called? Tha...
by Valman
Jun 18 2019 8:35am
Forum: Items for Sale - New
Topic: Wholesale 18650 cells (NEW) for UK/EU
Replies: 43
Views: 4636

Re: Wholesale 18650 cells for UK/EU

Got a box of 100 new Samsung 35e from this seller - great price, very good service, very professional, reccommended
by Valman
Jun 16 2019 3:50pm
Forum: Battery Technology
Topic: Charger Reccommendation Please?
Replies: 15
Views: 1084

Re: Charger Reccommendation Please?

Thanks for the advice so far, It's helped a lot. I liked the cycle satiator a lot, but being in the UK, the 24v version would cost around £350 after import duty, customs handling fees etc. ISDT T8 at £85 seems a good dc-dc charger. https://www.isdt.co/t8.html?lang=en I found a fantastic deal on a me...
by Valman
Jun 13 2019 2:13am
Forum: Battery Technology
Topic: Charger Reccommendation Please?
Replies: 15
Views: 1084

Re: Charger Reccommendation Please?

I'm unsure how many amps I need. given that I want to preserve the life of the cells - in a 7s13p pack, would I charge at 7x times the amps needed to charge a single cell, or 13x the amps needed to charge a single cell? My brain tells me it's the parallel that increases the amps, but I want to be su...
by Valman
Jun 11 2019 2:19pm
Forum: Battery Technology
Topic: Charger Reccommendation Please?
Replies: 15
Views: 1084

Re: Charger Reccommendation Please?

Valman wrote:
Jun 11 2019 2:16pm
john61ct wrote:
Jun 11 2019 10:01am
Or the Satiator, but that's only one at a time.
I looked at the satiator, but that didn't appear to do 12v, rather 24 volt and above. I don't need concurrent use for sure.
Also the sterling only seems to come in either 12 or 24v, unless you're saying 24v ones can also do 12v?

Thanks again
by Valman
Jun 11 2019 2:16pm
Forum: Battery Technology
Topic: Charger Reccommendation Please?
Replies: 15
Views: 1084

Re: Charger Reccommendation Please?

john61ct wrote:
Jun 11 2019 10:01am
Or the Satiator, but that's only one at a time.
I looked at the satiator, but that didn't appear to do 12v, rather 24 volt and above. I don't need concurrent use for sure.

Thanks again
by Valman
Jun 11 2019 8:58am
Forum: Battery Technology
Topic: Charger Reccommendation Please?
Replies: 15
Views: 1084

Re: Charger Reccommendation Please?

Thanks for the great input - I just realised, since I am buying a diy spot welder that is powered from a 12v car battery, instead of buying another car battery charger £90+ , maybe I can buy one good charger that's suitable for both purposes, recharging the 12v lead acid car battery, and also mainta...
by Valman
Jun 11 2019 5:49am
Forum: Items for Sale - New
Topic: li-ion 18650 Adjustable size BATTERY HOLDER - Honeycomb Layout
Replies: 49
Views: 14067

Re: li-ion 18650 Adjustable size BATTERY HOLDER - Honeycomb Layout

Can you also please confirm that the nickel here is high purity? - i.e. 99%+ purity? (from what I read here, there are a lot of sellers selling nickel with low purity that isn't good, and doesn't pass a salt corrosion test - thanks)
by Valman
Jun 11 2019 5:46am
Forum: Items for Sale - New
Topic: JP spot welder
Replies: 1242
Views: 184142

Re: JP spot welder

Good luck with your new work. I sure got my money's worth out of my welder so far. Still working perfect. Img_1098A.jpg This is very close to how I plan to build my first battery, the way you've laid out the nickel strips and how things flow through the battery - Can you tell me what materials and ...
by Valman
Jun 11 2019 5:34am
Forum: Battery Technology
Topic: Charger Reccommendation Please?
Replies: 15
Views: 1084

Charger Reccommendation Please?

I'm building my first battery pack - 7S13P Samsung 35E with a Daly Electronics 7s 24v BMS http://www.dalyelec.com/product_view_250_109.html 60a 24V common port version https://www.aliexpress.com/store/product/Waterproof-7S-15A-25A-35A-45A-60A-24V-Lithium-Battery-Protection-Board-BMS-Electric-Charge-...
by Valman
Jun 09 2019 4:05pm
Forum: Items for Sale - New
Topic: li-ion 18650 Adjustable size BATTERY HOLDER - Honeycomb Layout
Replies: 49
Views: 14067

Re: li-ion 18650 Adjustable size BATTERY HOLDER - Honeycomb Layout

PM me please about payment details for shipping to UK for: 28x side covers 0.06 = EUR01.68 24x 6-cell-holder 0.15 = EUR03.60 28x 3-cell-holder 0.08 = EUR02.24 14x 2-cell-holder 0.07 = EUR00.98 16x 2-cell-terminated 0.07 = EUR01.12 24x 1-cell-holder 0.05 = EUR01.20 20x wire holder bms 0.08 = EUR01.60...
by Valman
Jun 08 2019 6:25am
Forum: Battery Technology
Topic: Battery pack casing options
Replies: 7
Views: 545

Re: Battery pack casing options

given that the pack will be sitting inside an aluminium tray, maybe the tray provides all the structural support needed - in which case i just need to wrap the battery with foam and kapton tape or heat shrink perhaps? what I don't understand is when people are fully wrapping battery packs, how are t...
by Valman
Jun 07 2019 4:49am
Forum: Battery Technology
Topic: Battery pack casing options
Replies: 7
Views: 545

Re: Battery pack casing options

Thanks for your input. Does the pvc heat shrink in cheap packs tend to be an addition to this, either underneath or over, or a cheaper/less effective alternative to this kind of structure? Thanks again
by Valman
Jun 07 2019 1:54am
Forum: Battery Technology
Topic: Battery pack casing options
Replies: 7
Views: 545

Battery pack casing options

I am building a battery pack to fit inside an aluminium tray which is 235x153 (mobility scooter) . What are my options for packaging the battery? I intend to use 18650 cells with hegaxonal spacers, but after the kapton tape is applied I'm unsure about what further wrappings I could use. I like the i...
by Valman
Jun 07 2019 12:06am
Forum: Battery Technology
Topic: Spacer/Holder for 21700 cells
Replies: 11
Views: 1176

Re: Spacer/Holder for 21700 cells

Turns out 3d printing is more expensive than I expected, I was thinking like £50 or something - the 3dhubs quote was over £200 :( guess I'll need to look into other options That's a shame. At that point it's almost cheaper to buy your own 3D printer and print the holders yourself. Were you looking ...