AW 14500 battery problem

[asnider123]

I have always used Trustfire Flames but I was given a couple of AW's .. they work wonderfully in a 3.7v PV, but whenever I use them in a pair in a VV, I blow a carto. This has happened 3 times now, on 3 different VV's I have made.

Why is this happening? The voltage set is the same as with Flames, but it seems like the AW's are a lot hotter or something. Guess I should stick to single-batt mods with these batteries.

 

[Dalton63841]

Hmm... what resistance are the cartos? The AW's are able to put out a much higher amp draw, but shy of LR cartos(which might hit an amp limit in the protected cells), I can't imagine the amp draw being different.

 

[asnider123]

cartos are 2.4 ohm, voltage set at about 5v, pop! with flames, it works fine. So the flames do act differently, perhaps because they do not have the ampacity of the AW's, at least that's what I'm a thinkin'

 

[Dalton63841]

What is the current capacity of Trustfire flames? From a quick google they appear to be 1.5C. IF that is the case then 900mAh * 1.5 = 1.35Amps.

2.4ohms @ 5v = 2.08Amps

It could be that the protection is kicking on and off and causing a greater voltage drop. Did you check loaded voltage again after putting in the AW's, or assume it would be the same? You may indeed need to readjust the POT to get it back to the right loaded voltage.

 

[asnider123]

What is the current capacity of Trustfire flames? From a quick google they appear to be 1.5C. IF that is the case then 900mAh * 1.5 = 1.35Amps.

2.4ohms @ 5v = 2.08Amps

It could be that the protection is kicking on and off and causing a greater voltage drop. Did you check loaded voltage again after putting in the AW's, or assume it would be the same? You may indeed need to readjust the POT to get it back to the right loaded voltage.

That's a really good point, bet you're right, the over-current protection is kicking in with the TF flames. I am ashamed to admit that I have been setting voltage with no load, just using probes in the atty connector. I will have to open the mods and check voltage levels with a load.

Thanks much, Alan

 

[Dalton63841]

Let me know what you find! I'm actually quite interested in this... I have only used AW's, so it's curious to get different voltages with batteries of the same voltage. My thoughts on the protected batteries are based sheerly on theoretical knowledge.