[NSRCA-discussion] Landmark for e-pattern: >1C charging

[Adam Glatt]

Chad and I tried the 1010's 'Fast Charge' setting on one of the initial 
V1.85 version chargers last month.  We found the end voltage to be 
inconsistent because the balancer didn't have enough time over 4.1v/cell 
to balance the pack, so the charger would get the pack to like 
4.18v/cell, quit, and then the balancer would drop voltage by an amount 
determined by the condition of the pack - this is bad if you want to 
series discharge and series charge (though series charging is limited to 
about 0.95C).

You guys should try the Fast Charge setting and watch the cell and pack 
voltages compared to 100% charge setting.  Maybe it was just the 1.85V 
firmware, or the packs.

-Adam

Steven Maxwell wrote:
>  If your using the 1010 charger and the 95% charge means your doing a full
> charge if you change to the fast charge which is 97% your charging time
> should decrease alot, the fast charge takes out the final steps of charge,
> you might ask on RCGroups either everydayflyer or Charlie Wang will answer.
> Maybe Adam will answer here.
>  Steve Maxwell
>
>
>   
>> [Original Message]
>> From: Cameron Smith <dentdoc007 at adelphia.net>
>> To: NSRCA Mailing List <nsrca-discussion at lists.nsrca.org>
>> Date: 3/15/2006 7:43:23 AM
>> Subject: Re: [NSRCA-discussion] Landmark for e-pattern: >1C charging
>>
>> I have been using that charging combo.
>>                       
>>  Charging 4 new TP 2100mah Prolites @ 1.5C to 95% capacity in about 35
>> Minutes. (On 2 charger combos)
>>  This yields easy 10 minute flight on a 300+ watt system per battery,
>> using around 1600-1700 mah. 
>>  
>> After following Charlie's advice I tried 2C but only gained less than 4
>> minutes in charge time so I backed it down. I pay for my packs so I want
>> to see others do 3C for a longer period of time before I "Crank it up"
>>
>>  After doing this the old 1C rate/single charger for a couple years now,
>> 4 times as much in 1/2 the time is Cool!
>>
>>  I agree with Adam, This is good news for electrics.
>>
>>
>>
>> -----Original Message-----
>> From: nsrca-discussion-bounces at lists.nsrca.org
>> [mailto:nsrca-discussion-bounces at lists.nsrca.org] On Behalf Of Adam
>> Glatt
>> Sent: Tuesday, March 14, 2006 11:16 PM
>> To: NSRCA Mailing List
>> Subject: [NSRCA-discussion] Landmark for e-pattern: >1C charging
>>
>> http://www.rcgroups.com/forums/showpost.php?p=5182816&postcount=24
>> That post is by Charlie Wang, head of Thunder Power.  Charlie has been 
>> running cycle test experiments where he cycles Thunder Power Pro Lite 
>> batteries with 2C and 3C charge rates, and 4C discharge rates.  His 
>> experiments have convinced him that 3C charging of Thunder Power Pro 
>> Lite batteries does not harm the batteries.
>>
>> This is a major step for electric R/C.  Consider a situation with one 
>> charger, two batteries, and 10 minute flights - low cost, typical 
>> pattern and sport equipment.  Charge times are inside of 30 minutes.  
>> Allowing 5 minutes for pack cool-down, it is possible to log 5 flights 
>> in less than 2 hours.  In a pattern situation this isn't yet possible, 
>> because it takes a 16A charger to charge the 5.3Ah pack at 3C and they 
>> don't exist.  Using available chargers, two TP 1010's ($320-$400), two 
>> TP 210 balancers ($140-$200), and four 5s4p5300 packs ($1100-$1300), the
>>
>> time for 5 flights would be something like 130minutes.
>>
>> 3C charging (currently 2C with pattern packs and available chargers) 
>> allows you to fly just as much with fewer batteries.  That saves outlay 
>> costs, if not cost per flight, and certainly reduces the length of time 
>> you are stuck with current technology.
>>
>> More good news from the electric world.
>>
>> Those of you planning on charging at >1C, make sure you read Charlie's 
>> post.  He gives specific guidelines and practices.
>>
>> -Adam
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