Endless Sphere

i got a bunch lifepo4's here. most of them take a dive when it gets under 10c. they tend to like higher temperatures. regular lipo's usually behave more even until you pass freezing then the lipo craps out and the lifepo4 takes the lead again. if people use their EV's as a daily driver i usually rec...

What you say about "not being a dick" to the battery is no doubt true in a rhetorical sense. Problem is that the very act of throwing a slab of battery on a mountain bike is to invite some degree of "dicking around" during which impact and vibration are par for the course ... i mean that you dont c...

18650's dont burn down houses unless you really be a dick to them. pouches is a no-no in my book, and workshop. use 18650 cells from a reputable brand and source and dont charge harder then you have to. if you have 8 hours to charge then set the charge rate to take 8 hours. i usually advise that the...

i pull them down to 3V on the tester on a 1 and 2A load.

Not all cells, the GA's i have on the torture tester are already losing capacity after 300 cycles.

here is a 29E after 1200+ cycles: https://i.imgur.com/WCvUgtf.png 90% of cycles are 4.05V>3.5V. draw peaks are between 1A continous and 8A peak. so about 200mAh loss after 1000 cycles is nothing less then perfect. this is also a 1A drain cycle and the official spec is based on 0.2C so there is that....

very nice.

always good to see good stuff happen.

Thanks for the suggestions. Almost home. Battery pack complete except for the outside heat shrink. Made some acrylic ends for it to keep it all bolted together. Want to use clear shrink if I can find it cause I think it would be cool to see the battery. Everthing seems to be working so far includin...

if a block reaches 3.78 then something is fucky. is that with the active balancing devices?

Then the charger does not put out 14.6 but something more.

It would, but the PF would still win if you lower the voltage on those. But you might need a few more cells to compensate for the loss in capacity but then you gain more current capacity and increase the lifespan again in favour of the PF. I never recommend anything above 2900mAh due to the massive ...

It probably has a shit motor that is already on the edge. Replacing it with a QS motor with higher specs and a matching controller will make the difference. But if you have lead then i would not do this as lead simply cant handle heavy loads. And diameter is not a factor in power. I have a 10" hub w...

GA have shit amount of cycles when using the full capacity range. At 4.05v its a different story but in general the PF have way longer lifespan.

The GA will wear out a LOT faster then the PF.

If all of them are hot then the battery is full and/or the charger voltage is too high so you are just burning up power directly from the charger to the balance boards.

13*4.05=52.65V

and yes, it is that easy. the slower and lower you charge the longer the pack lives.

i dont know how the ELN series behaves at top voltage. i only know the ELG and HLG dont go beyond their set voltage limit.

^^ "failed miserably"... Reasons? (EG, dealing with the pubic...?) they make you buy the scooter but you rent the batteries. so each month you have to pay and if you dont you cant get new batteries and you can only charge them on these stands wich means you are stuck with a scooter you cant use. wi...

they tried this exact system in amsterdam and failed miserably. the stands are 1000% identical, just the scooter brand changes every time i see this.

600A phase? what motor do you have that can take this amount of current without melting on the spot? and yes, basically you can replace the FET's for better ones (low RDSon is name of the game here) and double them up for example and do a current shunt mod to increase the current flow but at that po...

replace the bearings. also when the motor seizes check the resistance of the phase wires. you might have a dead short. then the motor will not move unless you put a prybar on it. with smaller motors you can overcome this by hand, but with a 9kW motor you have way too much magnetic holding power to m...

joelshort wrote: ↑

Sep 11, 2018 2:21 pm

Can 1 balance module be connected to more than 1 block?

you can ofcourse, IF you like a nice big ball of flames.

They they warn you for that then its a shit charger. The only thing it as to do is do a CC/CV charge up to 14.6v, just like any other lithium based battery. If it goes beyond that you need to get another one.

these only provide a top balancing, they dont do anything to prevent over discharging. but considering your use case i would just ditch the whole bms, it does not do much exept drain the battery. connecting is simple, just match the symbols. black is positive and red is negative. same goes for the c...

http://www.bestechpower.com/balanceboard/HCX-D162.html 2 or 3 of these on each block and you are done. there is a minimum order quanity for these so just order 12 of them. make sure you order for lifepo4 and not lipo. you can buy nockoffs on ebay but those have very little balancing current so you n...

i think the cells were not saturated enough. they need to be kept floating longer at 3.65V in order to recoup more capacity. OK, to recap what I have done: I took the block that originally read 3.32v and I float charged it at 3.65v for about 16hrs. After resting for 20hrs it now reads 3.44v. Should...