Kpowell911 Posted August 25, 2010 Share Posted August 25, 2010 I've charged in my house without the bag before, I never leave them unattended however Quote Link to comment Share on other sites More sharing options...
Matt B Posted August 25, 2010 Share Posted August 25, 2010 I've charged a bent LiPo in my house before, I've bent a bent LiPo back in shape, and I've charged a 3s pack that was registering 7v. No fires as of yet, and I've not got a LiPosack either. However I wouldn't reccomend doing all of these things Quote Link to comment Share on other sites More sharing options...
skree Posted August 26, 2010 Share Posted August 26, 2010 is it better for lipos to charge them at lower than 1c? those turnigy 2s hardcase lipos make a very strong case for themselves (if they fit in an e-firestorm) in the low 20s Quote Link to comment Share on other sites More sharing options...
Garry Posted August 27, 2010 Author Share Posted August 27, 2010 1C is perfectly safe, no need to charge lower than that. The only advantage of higher charge rates is the time its takes, so stick to 1C and you'll be fine. From racing in winter with LiPo, one thing I've noticed is that if the ambient temperature is low, then the pack doesn't discharge as quickly as at normal temps. Its like the pack is a bit flat, a bit low voltage. You can still run right to the cutoff, but it just feels lacking in the punch department. Some people say warming the packs will cure that, but I don't reccomend anything that externally alters the battery temperature (warming or cooling). Quote Link to comment Share on other sites More sharing options...
skree Posted August 27, 2010 Share Posted August 27, 2010 what if my charger isnt capable of doing 1c? my charge rig.. well i wouldn't want to pull more than about 3.7a from my big 15v psu and no more than 2 from my 12v psu which is like 0.7 and 0.4c respectively Quote Link to comment Share on other sites More sharing options...
Garry Posted August 27, 2010 Author Share Posted August 27, 2010 Then its time to get a new power supply? You can get an 8A PSU for just Quote Link to comment Share on other sites More sharing options...
skree Posted August 27, 2010 Share Posted August 27, 2010 (edited) my others were free though, i'm on a really tight budget hence why i'm only buying the £27 accucel 6. I'm not bothered about the time it takes to charge as long as i'm not damaging the battery.. certain lithiums are damaged by a trickle charge.. i've done an extensive google and it seems 0.5c charge rate is ok.. which is good enough for me w00t w00t it seems that charger will balance (equalize?) nimh cells too. this is very good although it does mean a slight redesign on my homemade packs (to include a balance plug) i like to keep my batteries looked after.. Edited August 27, 2010 by skree Quote Link to comment Share on other sites More sharing options...
Garry Posted August 27, 2010 Author Share Posted August 27, 2010 In that case, then its still fine to charge at a lower rate. 1C is a just the going rate really as it means packs will be done in around an hour. A lower rate will just take longer . Balance charge NiMH? The only 2 chargers which could ever do that was the Spintec and a version of the Protrak with certain attachment. Quote Link to comment Share on other sites More sharing options...
Ash1984 Posted September 3, 2010 Share Posted September 3, 2010 (edited) Now then, Something I need clearing up.... What rate should small Lipos be charged at i.e I'm looking at getting a 1S 3.7v 650mah pack for my Micro crawler, I assume you shouldn't be charging these at 1C? Does the little losi AA powered charger charge lipos? Finally I assume 1C packs mean 1 cell so no need for a balance lead? Thanks Ash Edited September 3, 2010 by Ash1984 Quote Link to comment Share on other sites More sharing options...
Spoonmeister Posted September 4, 2010 Share Posted September 4, 2010 1C is fine as this is relative to the capacity To get a 1C charge rate, convert the packs capacity into Ah and set this as the charge current, i.e. 5000mAh = 5Ah So 650mAh = 0.650Ah making 1C 0.65A. Quote Link to comment Share on other sites More sharing options...
TiM! Posted September 5, 2010 Share Posted September 5, 2010 (edited) The losi charger is nimh only. Edited September 5, 2010 by TiM! Quote Link to comment Share on other sites More sharing options...
Tatts Posted September 7, 2010 Share Posted September 7, 2010 Silly question, what LVC do i use on my esc, 3.2V or 3.0V (i don't know how it works lol) Quote Link to comment Share on other sites More sharing options...
TiM! Posted September 7, 2010 Share Posted September 7, 2010 I'd use 3.2V Others will say 3.0V but the fact is that the lower you go the more unbalanced the cells become. Quote Link to comment Share on other sites More sharing options...
Ash1984 Posted September 7, 2010 Share Posted September 7, 2010 Cheers for the answers to my questions lads. Quote Link to comment Share on other sites More sharing options...
Tatts Posted September 8, 2010 Share Posted September 8, 2010 I'd use 3.2V Others will say 3.0V but the fact is that the lower you go the more unbalanced the cells become. Thank you, i was thinking of 3.2V but just wanted to be sure Quote Link to comment Share on other sites More sharing options...
zebrevo Posted September 8, 2010 Share Posted September 8, 2010 bear in mind that LVC only "knows" the voltage of the whole pack, NOT the individual cells....... So a 2S pack 'could' have cell 1 = 2.90 volts, and cell 2 = 3.15 volts. TOTAL 6.05 volt. Or 3.025 volt / cell. As this is above 3.0 volts / cell the LVC set to 3.0 would be happy, but the lipo cell at 2.90 volts would not! so, 3.2 volt / cell is good, 3.4 volts may be better until you have a handle on how unbalanced your cells get during use. Quote Link to comment Share on other sites More sharing options...
YourMindRewind Posted November 24, 2010 Share Posted November 24, 2010 bear in mind that LVC only "knows" the voltage of the whole pack, NOT the individual cells....... So a 2S pack 'could' have cell 1 = 2.90 volts, and cell 2 = 3.15 volts. TOTAL 6.05 volt. Or 3.025 volt / cell. As this is above 3.0 volts / cell the LVC set to 3.0 would be happy, but the lipo cell at 2.90 volts would not! so, 3.2 volt / cell is good, 3.4 volts may be better until you have a handle on how unbalanced your cells get during use. This is a excellent thread. Good advice. Am I right in thinking that as long as you set the battery capacity and voltage then the charge current doesn't need to me set at the max of the charger. I would like to charge my 5000mah 11.1v 3s battery at 1C to maximise life. Charging at 4.2 A is ok?? Quote Link to comment Share on other sites More sharing options...
Garry Posted November 25, 2010 Author Share Posted November 25, 2010 Yep, thats fine, it'll just take longer to charge than at 5A. But if your charger can charge at 1C, there's no point charging at a lower rate. Quote Link to comment Share on other sites More sharing options...
fredd09 Posted November 27, 2010 Share Posted November 27, 2010 For a Brushed HPI E-Firestorm, would 3s or 2s be better. because I want to be able to do two battery's continuously without the motor getting to hot. Also would hard or soft case be better. thanks Quote Link to comment Share on other sites More sharing options...
TiM! Posted November 27, 2010 Share Posted November 27, 2010 3s will probably make the ESC explode. Might get away with 2s though. Doesn't really matter if they're hard of softcase in the firestorm, but hardcase might be a little safer. You will need a low voltage cut off really, the ESC doesn't have one so your pack could go below 3V per cell. http://www.modelsport.co.uk/index.php?product_id=30589 Quote Link to comment Share on other sites More sharing options...
fredd09 Posted November 27, 2010 Share Posted November 27, 2010 I don't get LiPo's. They confuse me. and I don't have enough money to buy the cut of. I might just stick with NiPH. Better safe than sorry Quote Link to comment Share on other sites More sharing options...
Spoonmeister Posted November 27, 2010 Share Posted November 27, 2010 Better safe than sorry Indeed It's worth saving up rather than jumping in as lipos tend to be quite expensive...especially with the addictive power Quote Link to comment Share on other sites More sharing options...
chappo Posted December 9, 2010 Share Posted December 9, 2010 Hi guys, i am charging my Lipo for the first time, i have an plazma 7.4v 3000mah 20c, hard case, ( i know nothing about these at all, the more i read the more i get confused ), i have a balance charger and its charging at 3.0a and on 2cl is this correct, ( before it goes bang lol ). Quote Link to comment Share on other sites More sharing options...
TiM! Posted December 9, 2010 Share Posted December 9, 2010 3A is the correct output for that pack yes. Quote Link to comment Share on other sites More sharing options...
chappo Posted December 9, 2010 Share Posted December 9, 2010 3A is the correct output for that pack yes. cheers mate, but what does the 2cl stand for when its charging, and is that set correct as well, Quote Link to comment Share on other sites More sharing options...
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