fordman86

iTrader: (35)

I have a 2500 5 cell pack I made out of energizers for my maxx and don't remember how much they were charged when I put it away for the winter. Now I went to charge it on my ice charger and get no where near 2500 mah. And cycled them 2-3 times with charge of 1 amp charge and 2 amp discharge with 5 mv detection. The numbers went down on each charge. Then cycled them at .2 amp and 2.5 discharge and got about the samething no where near 2500. Are the toast or maybe just 1 or 2?

fordman86

iTrader: (35)

anyone?

How do I tell if I have a bad cell?

Rysuleod

iTrader: (1)

I'm not an electrician... but you could use a voltmeter to check the charge on each cell. If one is dead you'll be able to tell pretty easily.

That0neguy

What parmameters you cycleing them at?i.e. cutoff,discharge Amps...

fordman86

iTrader: (35)

And cycled them 2-3 times with charge of 1 amp charge and 2 amp discharge with 5 mv detection. The numbers went down on each charge. Then cycled them at .2 amp and 2.5 discharge and got about the samething no where near 2500. I have since cycled them at .2 at with 8 mv detection and 5 min peak detection with .9 (normal for stick packs) discharge cut off per cell at 2 amp discharge. I had another I made but was 1850 and it is doing a better job so far up to 1744. All cells had 1.25 volts (took pack a part)

That0neguy

Try cycling them at 2amp charge. 10 amp dishcharge.It makes sence when the chargers made for them by the same company are 15 min charger....

fordman86

iTrader: (35)

go that high on a 5AA battery pack?

octane3117

well storing them that long and not cycling the periodically can cause the cells to go flat. also i know your not uising aa size since and emaxx is a monster truck. but five cell packs arent usually enough to run an e maxx so not sure wht you did exactly. if they are c cell size you can charge at 4 to 5 amps to try to gewt the voltage back in them and discharge at the highest setting you have since an electric run vehicle can peak draw at 40 amps and will draw at a constant 25 to 30 amps. thats why getting the mah's in your cells is important to get the run time you need.

good luck and the only way you can tell if they are dead is try a newer pack and see how they work in the truck compared with your home built sorry to mess you made for yourself.

fordman86

iTrader: (35)

Ok a little info.

This is on my T Maxx and it is a homemade RX pack (hump pack) and it is made out of 5 AA 2500 energizers batteries.

Here is a little update I took apart the 2500 pack checked all cells they all tests 1.25+ volts. Put back together and now charging at .2 and up to 1910 mah's and going up. So for some reason they are charging better. The 1850 mah pack charged to 1900+ at .2 amps so it seems ok.

XingXing

make sure the cells are all equal before soldering them. i.e fully charged or fully discharged.

if unbalanced, when you dischrge them, some cells may be going to 0volts and reversing

fordman86

iTrader: (35)

Since reassembleing seems to be working now.They are now at 1950 and still charging.

fordman86

iTrader: (35)

What is the highest charge rate I can go on the 2500 AA pack and still be safe and not hurt the batteries?

That0neguy

well for a rx pack you want real low so to give you maximun runtime.So like a amp.