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aKindlyBeast

efest imr problem

chaps,

I've bought a pair of 14500 efest imr and charged them using a nite core d2 so no problem there. however my modulus and stryfe don't like them. in fact with the conductor they barely fit, I can see they are arround 5mm bigger than the an aa duracell battery.

shouldn't they be arround the same size?
Dustybin

Can you link them, some of the IMRs on the Internet are actually trustfires with a protection circuit added to the negative pole (I have no idea what that wails be called).
UKNerfWar

It's right that 14500s are longer than standard AA's but usually only by 0.5mm.

Are you sure what you have is an IMR? That size difference would suggest to me that it's an ICR (Trustfire) with a protection circuit.
SSGT

As above. Similar issue here.

If they are "Gold" Efest cells (black cell with gold sticker as per photo from link above), or have "Li-ion" and/or "protected" or "unprotected" printed on the side of them, then they aren't IMR's even though they are (worryingly often, usually with false discharge specs aswell) falsely listed as such by sellers such as this. They are actually ICR (LiCo chemistry) cells more akin to Trustfires (same chemistry but Efest are probably better quality - either way they're unsuitable for powering motors) than IMRs (LiMn chemistry). If they are protected cells then they will have a PCB protection circuit slapped onto the negative terminal which accounts for the extra length. IMRs, AFAIK, never have protection circuits.
aKindlyBeast

Yeah they are the efest gold labelled 800s so that more or less answers that one.

can you guys recommend a decent imr that I can order for use in nerfing?
Dustybin

I say rewire and Lipo, the best thing you can do.
old_man_nerf

Rewire and lipo is best. If you want some decent imr's I'll sell on mine - from a reputable seller and lightly used. I just have an aversion to full auto blasters at the moment so the batteries have been in my rapid strike twice.
aKindlyBeast

Dustybin wrote:
I say rewire and Lipo, the best thing you can do.


lol only just managed to install upgrade spring in my eat without issue!

And..... I need it for David's game on saturday so won't have time to do any big mods...
OldNoob

Torchy ones are trustworthy. The range of 14500 cells has shrunk a bit lately, Torchy has been around ages, Efest are being cloned. You are not the only person on the forum to get suckered by those 800's, other people have done exactly the same.
Wire is less than the price of 2 IMR cells, so hardly expensive.
SSGT

It's also worth saying that if you don't rewire (or at least bypass the PTC fuse) there's a good chance the PTC fuse will cut-out mid-game under the increased current draw, at least on 3 cells. Of course that's assuming a solder joint, switch or inductor doesn't fail first.
aKindlyBeast

does anybody have any suggestions for how to deal with the flat top issue? I can't complete the circuit because the positive end is simply not touching the connector in the battery tray. I could add a piece of copper to bridge the gap but something tells me that is not a good idea....
OldNoob

If you are using two, rip the plastic battery dividers out the tray, then put the Dummy cells onto the + ends as they have buttons, then put the flat tops on the -ves, the flat top will make contact with the base of the Dummy, completing the circuit.
You can also use small nickel plated magnets on the ends of the cells. The flat tops are rubbish cells though, do not use for anything but stock motors.

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