Recent content by harper

hi there, as i,am with batteries from last 6 months i can say that it is pretty abnormal. my 18ah battery pack gave me around 45km at city ride it drew around 26 to 28amps@48v (SELF MADE). i am pretty sure that your BMS is the problem. but,also check your cells. even authorized manufacturers...

Here in India, import charges are more then 45%of total cost and we have to give bribe for customs to release it. So, I have bought it locally. Ebay doesn't work here. Only way is to buy from amazon (same sellers selling same product with triple the price) :oops: So,no other way other then...

That's the reason. Here, sellers will import old cells from China rewrap them and sell them on local platforms. Refund technique doesn't work as no one is responsible and seller won't even respond after purchase. No other way to get these cell other then this one way as my budget is low. It cost...

the pack is home made by me. the cells and bms are bought from seller

my pack is 18ah one and the cells are of 6ah each(15s 3p config) i have not capacity checked them as i know that they are not new cells i have no equipment to load test the cells. i doesn't even have enough money for buy cells of high quality. :( thanks for teaching me bro, now i can...

yes it is for LFP as seller mentioned and i have noticed. it does the same as noticed in the data sheet. thanks for your help my friend. i will discharge the pack soo low only for 1 to 2 times in a month if needed.

i don't know how c rating is calculated i only know some aspects about batteries. :( still learning about them. :|

my battery is of 15s and per cell voltage is 3.1v after bms got cut off(v 47.7v in total). bms out voltage is showing 43v but the cells are at 47.7v will discharging below 3.13v by bypassing bms will effect the cells :?: (as my controller is rated to work from 42v) the voltage sag is around...

its around 28 amps at max speed of 55kmph for some time (max 7 sec ). that's what i have noticed till now. cells i have used are of 3c and have 5c max rating.

i have checked the battery again yesterday and got around 50.1km of range :D :flame: with average speed of 28 and max speed of 55kmph. and the pack still contains so much juice (47.7V) but bms triggered because of voltage sags below 46v (bms low voltage trigger :lowbatt: ) my bms is not common...

i have charged them for once with bypassing BMS to know the problem and got these voltage variation. :( but after connecting bms it balanced them to safer voltages (3.4v to 3.5v ). :) and after resting it for around 2 hours the pack got down to 50.7v as usual :(

i think so.i have soldered thin fuses which only meant for 3 amps max(one fuse blown and one fuse disconnected). now, i changed them to 6amp max ones..

bro!!! i have tested the pack with my tadpole trike and got around 37km in a single charge and a top speed of 55kmph the fuses which i have soldered to cells were blown and i have reconnected to test it with my trike.. now, my battery is charging upto 51.2v (hope this 1v will give me some extra...

as we are in quarantine there are no shops available. i have charged every cell upto 3.6v by removing the bms from battery.. some of them got upto 4.1v with a total voltage around 54.2v. and then i have rested them for 2 hours connecting the bms. after that i checked the voltage, and got...

have you watched youtube channel with name (jehugrecia) :?: he also did the same 2 years back...but balanced cells with an external balancer. soldering cells will not get them damaged alot. after observing the cells for more then 4 days.. at last i get to know that the problem is with the...