It is a constant battle between the shops and shipping companies and regulations. It can include a lot of “silly” factors, like not specifying that the parcel contains batteries or putting batteries in cheap flashlights. I believe that all the Chinese shops has this battle where they try to ship batteries and due to changing regulation/polices it gets rejected.
One of the more silly is shipping with “Post Sweden” to Denmark or Sweden. “Post Sweden” is part of “Post Nordic”* that deliver post in both Sweden and Denmark, but they will not ship LiIon batteries to Sweden, only to Denmark (The shipping route is through Sweden) at the current time.
*That company is a political problem (The companies is government owned), “Post Sweden” bought (More or less) “Post Denmark”, transferred a lot of money from “Post Denmark” (There is no reason to own buildings) to Sweden and now “Post Denmark” is out of money (Big time).
I'm searching cells for the Convoy L6, and would like something with similar performance than this LiitoKoala INR, but ideally protected. I know INR chemistry is safer than ICR by nature, but I would get the double security combo, as I'm planning to offer this light. Which cells would be a good choice?
I’m pretty sure that high drain + protected is not possible, unfortunately, it’s one or the other. Others will be able to go into more detail but I’m quite sure the protection boards prevent cells from being ‘high drain’ cells.
if you do want some good protected cells tho keeppower make good ones.
fneuf, cell model numbers are not chemistry recipes and neither normalized ratings. The actual chemistry of most modern quality cells I believe is likely either Lithium Nickel Cobalt Aluminum Oxide (“NCA”, LiNiCoAlO2) or Lithium Nickel Manganese Cobalt Oxide (“NMC”, LiNixMnyCozO2). Source: Lithium-ion battery @ Wikipedia, the free encyclopedia
Protected batteries usually are not high drain types mostly because protective circuitry with enough MOSFETs to handle all of the current simply doesn't fits in the limited available space of a tiny board.
Protection boards add in series resistance to cells, this lowers energy output (voltage and capacity). A typical DW01A plus dual 8205A MOSFET protection board probably adds ≈15mΩ of burden resistance. They also consume power to feed the protection circuitry, something which eventually ends up discharging the cells and self-tripping the over-discharge protection.
Li-ion technology wasn't mean for careless and uninformed end users. Proper user education is always the best approach.
Thanks for this thorough and well wrote piece of information. You are right.
That said I never planned to offer it without educating the "gifted". But I sure also would like to minimize any risks. It's kind of doubling the security measures, too much is never too much. I'm trying to find the hazardless setup to fuel this L6 light. If I rephrase, my need would be "What is the safest way to store 6 to 8.4v in a 2x26650 space?". And at that point, without any magical AAAs to 26650 adapters appearing somewhere (with also really strong hopes that sag would not kill them), the safest energy option seem to be KP 5200 protected cells.
User measurement inconsistencies all over the place, at times in a wild way. Honestly, one would not expect this from a reputable cell manufacturer (Power Long Battery), so something fishy is going on behind the curtains. This could be because of rogue merchant dealing with and selling factory rejects, or who knows what other trickery.
The one I posted is linked directly from Littokala’s website.
I ordered 4 of the new blue 5100mAh 26650s about a week ago. When they get here, I will check-test the capacity and internal resistance with my chargers.