kamiKAZIK wrote: ↑
Jun 21 2019 9:11am
I've been using a battery pack using these, v1.5 to be specific, in my DIY electric scooter for roughly 7 months. All was splendid till one day it started shutting down out of the blue. I started pulling everything apart, checking BMS, checking controller.
Controller is fine, BMS though was showing some weird values, it was clear that something wrong was either with BMS or the battery. I've tested the BMS and it seemed to be working properly, then I started to disassemble my battery (10s4p) and holly fu... About ~70% of the caps had cracks, those at the edges of the pack didn't even made a proper contact with the battery.
A warning to those who consider these when building a pack for a bike or scooter. I don't think these were made to withstand constant vibrations. For stationary applications these might be great as they can give lots of flexibility, but where sturdiness is required, these don't seem to last very long.
So here I am. With a handful of broken caps and probably some damaged battery cells, still need to check every single one of them.
Does anyone know of any other solderless battery systems? Any suggestions? I was looking at NESE and those seem to look much more reliable than these and similar systems.
Thanks for coming out in the open. The composition for the V1.5 was changed twice. In fact the caps themselves were changed twice. Initially they were similar to the V1 version, we upgraded them to the V2.0 caps without changing the V1.5 nomenclature. It was after the launch of V2.0 that we once again changed the polymer composition making the caps a lot more resilient to elements. Further,we continuously carry out R&D and lab tests on the polymer and components we use. Micah had specifically addressed this cracking issue in one of his videos a while back and had asked anyone having a cracking issue to write to us. if you go through maybe page 17-19 of this thread you will see it has been mentioned here too.
I can more than assure you these are built to last. We have a simple refund/replacement policy. if there is an issue with the kit you have got please write back to us as you are entitled to a full refund/replacement.
Infact having this policy in place has enabled us to grow faster and learn more. When people are aware that the kits are readily replaced or money is refunded without opening a paypal dispute they tend to be more cooperative and descriptive of the issue. As well as a lot more supportive.
I request you to drop us a mail at vruzend(at)gmail(dot)com and you will be given a full replacement/refund.
We once more request anyone reading this thread who may have had a similar experience to reach out to us so we can make it up to you.
We are forever indebted to the DIY community here, and shall always strive for improvements which is evident from our yearly upgrades and improvements as well as our customer relation policy.
I sincerely look forward towards receiving an email from you. if possible do attach some pics too as pics always help us to study the issue at hand and bring about more changes.
If there is anything else just hit us up.
PS- This is exactly why the V2.1 and V1.6 were beta tested on projects that would push them to their limit, mainly a formula E race car, a solar car and a paramotor (there is a paramotor video too that we will be coming out with shortly)