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North257

Help needed for stryfe and IMR 14500

Ok so firstly I bought 2 IMR 14500 and 2 dead cell batteries and the IMR is slightly larger then a normal AA battery, so it's a real tight squeeze to fit them all in the stock tray. Secondly, I charged the IMR for like 10 mins to check they would work and they did, so I then fully charged them and now they don't work? Any ideas?






blindgeekuk

I think Justajolt had the same problem, those ones aren't actually imrs
North257

Are they not? What are they then? But why did they work and then not work after being fully charged?
SayYesToCress

Are they protected cells? That might explain the extra length. At full charge voltage the motors might be trying to pull more current than the protection circuit will allow.  Is the stryfe rewired? Could be the thermosistor tripping to protect the oem skinny wire.
North257

Possibly, you think if I get shorter ones they would work?
SayYesToCress

I know 2 of the v2 red efest imrs with 2 dummies worked in my son's stryfe when it was stock inside. Ymmv.
North257

Did they fit in the tray without a squeeze?
SayYesToCress

Yep, standard aa/14500 sized. Think it was ledfiretorches or something I got mine from a few months back.
OldNoob

Cut a few turns off the tray springs and be sure to take the orange battery dividers out. You have bought the longer flat top ones, not ideal, but will fit with a couple of turns off the spring.

Edit- I forgot these were LiCo protected junk. Thanks Justajolt. OP- bin those, get better ones.
North257

Ahh yeah I didn't think of that, you think that might make it work?
Justajolt

I tried that, it still didn't fit correctly and those batteries really didn't seem to do what I wanted them to anyway Sad
Here's my video on your issue!

https://www.youtube.com/watch?v=ZkZ8V5sS_7Q

Whilst the ebay lot may have deceptively had the word IMR in the title, they're not the LiMn batteries which we're looking for! Search for 14500 LiMn unprotected and you'll come up with some options which will suit your needs. Check with some of us on here if you want to before you buy.

I know that tbn's just been looking for some too, since the red efests whch were used before are becoming rarer. Ask him what he got and how they're working out for him ^_^ I'd be interested to know too, actually, so I might ask him myself at some point...
SayYesToCress

The red efest are in stock on the site I mentioned, not so rare as you might think Very Happy
SSGT

As noted the black and gold Efest cells are not IMR (LiMn) cells even though some sellers are advertising them as such along with false discharge figures (they are not capable of discharging anywhere near 16A continuous). They're ICR (LiCo) cells, the same chemistry as Trustfires and practically no better for our purposes. The base cell is actually the same length as the red Efest IMR cell (they are both 14500 size - 14mm diameter 50mm length) but the black and gold cells have a protection PCB slapped onto the negative terminal, and hidden under the shrink wrap, which adds a few mm to the overall length. You can likely get black and gold Efest ICR cells without a protection circuit but they should also be avoided since they are still the same basic cell underneath and still incapable of supplying the current required - you're effectively removing the circuit that prevents the cell from being dangerously over-discharged (if the protection PCB on a protected cell trips then you're already trying to draw too much current from it making using an unprotected version an equally bad idea).

I have never seen a protected IMR. They are a "safe chemistry" cell and capable of higher discharge rates so they don't tend to need them. If the listing mentions "protected" or even "unprotected" in the name then it's most likely not an IMR cell - don't buy. If it mentions "Li-ion" in the name it's also unlikely to be a genuine IMR cell (although LiMn is a Li-ion chemistry the term "Li-ion" is usually applied generically to LiCo cells). The black and gold cells likely have both "protected" and "Li-ion" printed on the side of them.
Justajolt

SayYesToCress wrote:
The red efest are in stock on the site I mentioned, not so rare as you might think Very Happy


Ledfiretorches...

I should read more carefully... thanks for that ^_^
North257

Wow thanks guys, so I'm sending these ones back and purchasing some REAL IMR 14500, would anyone be kind enough to recommend any? I also have my stryfe sent off to be fully re wired and have a cherry DC2 switch installed, so what would be the best IMR to buy?

Also with my stryfe being re-wired, I'm guessing that 2 14500 IMR would be as far as I could go without replacing motors?

All help and advice is hugely appreciated
Justajolt

I've just looked on here:

http://www.ledfiretorches.co.uk//power/batteries

But the useful ones seem to be out of stock.

Due to a correspondence I just had, I also have reason to believe that these are also a little suspect due to being too short! http://www.ebay.co.uk/itm/2x-AWT-...item2eed79da15:g:1PYAAOSw8KNW~X~c

Since when did 14500 stop meaning 14500?
North257

I honestly didn't think it would be this hard to find any ha ha I think we should try sticking to IMR that are the same size as standard AA batteries ?
North257

http://vi.raptor.ebaydesc.com/ws/...pm=1&ds=0&t=1464626348104

These possibly?
SSGT

North257 wrote:
http://vi.raptor.ebaydesc.com/ws/...pm=1&ds=0&t=1464626348104

These possibly?


No those are about as bad a cell as you can get. Not only are they not IMRs (they're standard LiCo cells - note that the listing mentions "Li-ion " and "unprotected"), meaning that they can't supply the required current, they're Trustfire LiCo cells - a brand renowned to be appalling quality. Like I said, if the listing mentions "Li-ion", "protected" or even "unprotected" in the name then it's almost guaranteed not to be an IMR cell.

I'd normally recommend red Efest IMRs but since there are now so few 14500 button-top IMRs about on eBay now (probably in no small part due to people trying to get a quick performance boost from their Nerf blasters - FK180SH-3240 motors went the same way) you might have little choice other than getting those yellow AWT cells that justajolt linked. Their discharge rate leaves a lot to be desired (4A continuous vs red Efest V2s which tend to be 7A continuous) but they're far better than the 1A continuous discharge of the Trustfires. If the AWTs are in fact slightly too short that shouldn't be an issue either since the spring terminals will make up the gap.
Dustybin

No, just no. Never use trustfires or ultrafires, they are terrible. They have a high internal resistance, low amp output, the stats are lies and they are dangerous. Just wait until ON posts, just a warning...
SayYesToCress

Someone must have hammered ledfiretorches stock! I gave up on eBay and Amazon trying to find the efest when I was looking. Try vaping and torch websites, I think I found several sources when I searched a while back but can't remember the names.
North257

https://www.elegantvapour.co.uk/e...igh-drain-battery-button-top.html

These?
OldNoob

Those are the right ones.
TBH if I was you I would skip the IMR altogether and just run a small 2s  Lipo. Better, cheaper and able to support MTB Honeybadgers.
This pack fits under the stock tray. Charge wise this is adequate and can run off any 12-18v laptop PSU. I run one of these but they need an XT60 output from your mains adaptor or a Turnigy power supply . Both those will utterly wreck IMR's and provide you a solid base for all your hobby needs.
North257

OldNoob wrote:
Those are the right ones.
TBH if I was you I would skip the IMR altogether and just run a small 2s  Lipo. Better, cheaper and able to support MTB Honeybadgers.
This pack fits under the stock tray.


Well I'm sending my stryfe off too foam_data for a re-wire tomorrow so I can run IMR, I'm starting from the bottom and working my way up,
OldNoob

Given that I am doing your rewire (OLDNOOB was my first foamy Nom de Guerre) and I won't charge you a penny more for adding pack compatibility (I put the spare wire in all my builds to allow it anyway) then I would think before hitting "buy"
North257

Ha ok well I feel slightly stupid! So you're going to wire the connections to run 2s lipo?
OldNoob

I can wire anything you want, it's all the same, just has a different terminal on the end. I have one of those packs in stock somewhere too. I don't tend to throw my FDS credentials around, sorry if that confuses people.
The only difference between the loom for IMR and the Lipo version is 2" of wire. When I do any I!R build I wrap that much wire inside the stock block or tray area so when the owner upgrades/sees sense then it's easy for them to do.
North257

Ok well you've convinced me ha, I'll scrap the IMR and go for a 2s lipo!
OldNoob

Chat about detail on Discord? I will be on at 8.
North257

Ok I'll speak to you then
Justajolt

You want LiMn specifically.

Trustfires and ultrafires will give a small increase over regular 1.5v, but it's worth getting LiMn.

I've never seen one blow up or anything, but IMRs will give you better results.
tbr

Here's a quick comparison photo of the IMR's justajolt mentioned and a standard AA.



Having two in a row in a stryfe doesn't work (due to central plastic separators and shortness of battery) but having a blank and IMR in a row, with the blank at the spring end and they work fine, but I hadn't tested extensively, for any potential problems.

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