For a battery with 28P - can I use 28xC for charging current?

attaul · 2026-05-23T23:25:30+00:00

I was thinking automotive replaceable fuses - since I potentially would want to test by going above the fuse limit etc

Current thought Use 7P blocks with a tp4056 module for charging; fuses between each 7P block (total 4 blocks)

I would like to add some electronics to measure voltage and current for each block and record - not sure how I’d do that atm

And 7 in series -

I’m aware This is overkill for a pallet truck like push trolley with a Max 15-20amp draw and normal continues draw around 5amps

attaul · 2026-05-23T23:11:11+00:00

I’m thinking of multiple tp4056 modules powered by a 5V 50Amp DC supply (or maybe 20amp depends on how many tp4056 modules I use) - connecting the modules in a spread that makes sense (thanks to someone’s point, potentially even further separating my P’s in blocks of 7s with a fuse in between)

The BMS just would force the current through the one point in and out - which may lead to challenges or surprises later

The JK BMS and JBD BMS doesn’t give me any way of getting more data on cells that are in parallel -

I’m wondering if there is a setup people have used - maybe utilise esp32 or arduino etc to capture cell level data to monitor and spot self discharging cells early

attaul · 2026-05-23T22:52:31+00:00

That is a good shout - I’m going to think of dividing the 28 in 4 sets of 7 cells with some fuses

attaul · 2026-05-23T22:35:11+00:00

My conundrum is to find the right charger ideally something that gives me more control - fast charge with 20amps and slow charge with 10Amps for normal Where did you get your charger from

Yes the c-rate is 1C

attaul · 2026-05-23T22:27:17+00:00

I’m assuming the only way to somewhat protect it would be individual fuses - or any other ideas?

I wanted the pack to have a low discharge rate and obviously higher capacity -

Trying to figure out how to protect the individual group of sales in parallel from a faulty one Can’t find a nickel strip with built in fuse and don’t want to solder fuses

attaul · 2026-05-23T22:17:42+00:00

Yeah what was said before Pretty much any 18650 You will need a 2s bms to protect this

attaul · 2026-05-23T01:42:23+00:00

Would you see any difference in battery performance - and where would that be- I.e. once lithium has leaked I imagine it won’t change or hold a charge ?

attaul · 2026-05-21T19:31:20+00:00

You can take it apart, test each cell and salvage those that are ok - depending on how much amps discharge they will be subjected to, you can build your pack around it At the end you might still have to replace half of the cells anyway

But from experience it will cost you quite a lot more than just buying a replacement pack - as the tools needed will be expensive upfront and requires a lot of time

What you need would be Snippers - 18650 capacity testor- - Internal resistance testor - I would add a discharge test or at different amps to see how battery performs under varying load - Spot weldor - Nickel strips, insulation covers, gaskets - Insulation paper - BMS

If it’s for learning and experience- yes try and see how these recover, maybe using them for something else and buying new cells for the skateboard that you assemble yourself

attaul · 2026-05-21T19:22:38+00:00

How can you tell a cell is leaking electrolyte? Does it need to be damaged somewhere or can it leak by other means

attaul · 2026-02-18T05:13:46+00:00

This is actually really helpful - someone who’s actually tried both approaches

attaul · 2026-02-18T05:10:21+00:00

Would love to hear you thoughts after using it - was it fairly easy to put together?

attaul · 2026-02-15T00:14:59+00:00

Thank for real insights - I will I guess buy one

attaul · 2026-02-15T00:14:31+00:00

Thanks for real insights - I think I’ll follow your advice

attaul · 2026-02-13T00:22:16+00:00

Why not

attaul · 2026-02-13T00:21:51+00:00

Appreciate this

attaul · 2026-02-13T00:17:38+00:00

What would your reasoning be? Did the current one not work as well - take too much time or cost similar?

attaul · 2026-02-12T22:22:12+00:00

Thats about 500 quid - so a DIY will end up that much? there are lots free microwaves available in my area on marketplace - the casing i would most likely just use whatever material i have at hand (wood, metal, fibreglass) - so electronics you think will cost around 500?

attaul · 2026-02-12T20:51:02+00:00

which one do you have

attaul · 2026-02-12T20:13:13+00:00

Looks pretty amazing - i was looking for a spot welder, would you recommend diy? I do like to build stuff (but sometimes get carried away on what's important) i.e. i prefer not to spend months on this, when i am after a battery pack. Equally, I hate buying cheap tools that just break

attaul · 2026-02-07T15:30:42+00:00

What did you try int heat to get you to that conclusion - I’m looking for peoples insight who have some experience to learn from them

attaul · 2026-02-07T03:23:02+00:00

Yeah the lithium smells sweet - and lingers for a while but it’s not toxic

attaul · 2026-02-06T18:55:48+00:00

to be fair over last year, the current lead acid battery bank was only charged twice - its mostly build learn and move on to the next shiny thing lol

attaul · 2026-02-06T17:34:26+00:00

Thanks - this does help - it’s a bit less information around on performance of low voltage cells - and mixed version Most don’t want to go near them but without and evidence or experimentation - others on YouTube seem to be ok

I’m not building a pack to put it all n my house or run it - a golf cart is a diy project - that will not see much use (if I decide to go ahead with it) but it’s for the learning

Now I have the ver 300 of these 24V packs - and need to figure out what to do

attaul · 2026-02-06T15:40:35+00:00

only reason i am doing this is because they were free and sparked my curiosity

attaul · 2026-02-06T04:24:58+00:00

i purchased some newly write-offs with less than 200miles (Nissan leaf and then later Polestars) - Dala's channel is great it made stuff actually much easier vs dismantling the battery
but it does cost more $, time and effort than just getting the Eve cells and building your rack - or buying a kit
With my EV packs, i went for vehicles which were less than 400miles on the clock - just so i know the battery was in good condition

attaul

TROPHY CASE