what does this mean??

[kookie_guy]

from some e-bay batteries....."High Drain Performance (up to 3c)"

secondly, do I want a higher or lower drain rate for an e-maxx? that crap is confusing. someone help.

[nicholcgn]

I am assuming a lipo battery? This is the only batteries I see with a c drain rating.

Anyway the "c" rating of a battery is based on the rating of the battery. If you have a 4000 mah battery You would charge at 4 amps for a 1c rating.
You can also drain them per their discharge rating in c. So the same 4000mah battery can drain at 3c or 3*4 for 12 amps.(1000 mah is 1 amp).

You need to understand the amp draw of your equipment before you know a battery can hanndle the drain. If you draw to much then you will damage the pack and have the chance of an incedent.

If you are not extremely confident in picking the correct batteries I would recommend a good nimh set and charger. I am a huge fan of LIPO but BEWARE. IMPROPER USAGE OF A LIPO CAN CAUSE FIRES!!!! IT IS SAFE IF USED CORRECTLY.


I am not sure the amp draw of your equipment but I would assume that you would need something in the mid 150 amp range atleast. Also you need to make sure that you have a LVC device so you do not overdischarge your batteries. So an 8000 mah battery to support a 160 amp you would need a 20c discharge rate continuous. Please make sure you know the requirements of your equipment.

[kookie_guy]

holy crap. this is all confusing. it's for an e-savage, which I understand has basically the same motors, or similar to an e-maxx

here are the actual packs...

http://cgi.ebay.ca/2-x-7-2v-4300mAh-4300-mAh-NiMh-Battery-Pack-3300mAh_W0QQitemZ230074834478QQihZ013QQcategoryZ34 063QQrdZ1QQcmdZViewItem

[evst 360]

that is nimh, and they are saying 3c. "C" means capacity divided by 1000 ( I think). A 1c rate is 4.3 amps for that battery. They are saying it can be charged at up to 12.9 amps. BS. A safe charge rate for all nimh's is 1c, which is in this case, 4.3 amps. That should charge the battery in one hour.

I would suggest going a different route with the batts. Try radioshack of all places. They have some gp3300's for $25 that will suit your needs well I think. Maxamps has some cheap batts too. Good quality 4400's for just over $40. check them out (http://www.maxamps.com/index.html?lmd=39085.562292) :cool:

[kookie_guy]

that is nimh, and they are saying 3c. "C" means capacity divided by 1000 ( I think). A 1c rate is 4.3 amps for that battery. They are saying it can be charged at up to 12.9 amps. BS. A safe charge rate for all nimh's is 1c, which is in this case, 4.3 amps. That should charge the battery in one hour.

I would suggest going a different route with the batts. Try radioshack of all places. They have some gp3300's for $25 that will suit your needs well I think. Maxamps has some cheap batts too. Good quality 4400's for just over $40. check them out (http://www.maxamps.com/index.html?lmd=39085.562292) :cool:

one problem...I already have em. hehe. I recently started reading about this discharge crap, and so I was curious. they've never ran yet, but I wanted to clarify what the hell that ment. so they are probably talking about the charging with that statement, not how much they can handle??

[ElectricThunder]

one problem...I already have em. hehe. I recently started reading about this discharge crap, and so I was curious. they've never ran yet, but I wanted to clarify what the hell that ment. so they are probably talking about the charging with that statement, not how much they can handle??
If they're talking about discharge, a 3c rate is nothin' special; however, they're most likely referring to charging, as mentioned already. They should be fine to run though for some bash packs. Monitor them for the first few runs, make sure you're geared properly, and see if the batteries get excessively hot.

[Stuart B]

isn't 3c pretty low performace? Thats a max drain of 12.9 Amps.

Stu

[ElectricThunder]

isn't 3c pretty low performace? Thats a max drain of 12.9 Amps.

Stu
If they're talking about discharge, yeah. That's why I told him to monitor the packs the first few runs, just in case the site IS referring to discharge rate. :eek:

[kookie_guy]

see, it makes sense for them to be 3c for charging. the way they word it, that's it's UP TO 3C. the e-savage they are in is completely stock. I'll get my brother in law to keep an eye on the heat. thanks for the help. I will post once I get some results from them.

[kookie_guy]

ok, quick update.....

went to my brother in law's house, cuz now I was thinking about the batteries. they were fresh and fully charged, so we took it outside. bashed the living crap out of it, pretty well at full out non stop. truck ran strong as hell. at the end of the session (10-15 mins, wasn't really paying attention) brought it back in, the the batteries were just barely warm.

so, conclusion, I think the 3C they refer to only applies to the charging. Because there was a lot more than 12A being sucked from these puppies, and they barely warmed up.

[one85_db]

It says 3C discharge but it could also be a misprint, maybe it should be 30C???

[kookie_guy]

It says 3C discharge but it could also be a misprint, maybe it should be 30C???


I was thinking the same thing as well when I started reading up on all this junk. oh well, batteries were tested under severe bashing, barely broke a sweat, so I'm not worried

[kookie_guy]

update....got an e-mail back from the seller. 30A is the discharge rate.

[one85_db]

Ah-Ha!!!