Li-Po 電一問

BTW, I want to buy one or two more Li-Po battery for TA05 RC,
Which one is better? Cost efficiency
PS: The max. output current of my charger is 5A in balance, fast and charge mode.

ThomasKwok 發表於 2012-6-18 17:03

                               
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BTW, I want to buy one or two more Li-Po battery for TA05 RC,
Which one is better? Cost efficiency
...

TA05第一樣要考慮既就係放得落咩電，因為佢原本既電兜係預你用NiMH直電或橫電，LiPo磚電未必舊舊方得落，但一般只要動動手術都應該OK。要留意即使買圓身鋰電都未必一定擺得落，因為通常都長過NiMH直電。講咁耐，如過擺得落當然用蕉通LiPo磚電最好。平平地我覺得都係SMC 50C可以一玩，不過小心唔好玩死電。

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smc 50c係幾多ma既model? 大約幾$?
我之前買左silver back 5000mah, 想買其他款比較0下

ThomasKwok 發表於 2012-6-19 10:18

                               
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smc 50c係幾多ma既model? 大約幾$?

好似係5200mAh，一樓賣$270。

ThomasKwok 發表於 2012-6-19 10:18

                               
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smc 50c係幾多ma既model? 大約幾$?

Ching,
How much was silver back 5000mah? Tks.

http://www.youtube.com/watch?v=ZEkewCjiDs0

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5000 silver black - $270
Just bought another 5200 silver black yesterday.
$330

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Seems a good deal Ching.
Where did you buy it?
How many C is it for 5000mah and 5200mah?
I am also planning to buy one. Thanks.

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40C
極X

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You got a big discount Ching.
I bought 4200mah 40C silverback at $278 last week at 極X...

又學到野呀..

搭單一問,
各位師兄用邊部差機.
點樣可以charge storage,
小弟岩岩玩, 完全唔識有關鋰電既野.
如果可以, 有冇類似差鋰電既教學.
我知好似問得好低能, 希望有師兄幫到手.

kenjiwu 發表於 2012-6-27 16:04

                               
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搭單一問,
各位師兄用邊部差機.
點樣可以charge storage,

差機人人都唔同
睇下你預幾多米
平平地首選imax b6 連火牛under$400
<<<差得慢~隱定性都幾好

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即係要部差機有Storage mode先得?
我得部i5, 即係要買過部.
咁平時係唔係差番1C就得?

kenjiwu 發表於 2012-6-27 22:42

                               
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即係要部差機有Storage mode先得?

如果你部機有balance mode
平時預返太約差到3.8~3.9V/cell 就可存放很久
d人話1C差電姐係 你舊電係3000mah就3A差, 5000mah就5A差

Ching,
After balance charge, my 2S new lipo gets 8.31v only? Charger shows 8.4V but voltmeter shows 8.31V. I check the individual cells, they add up to 8.31V also. Is that normal? Tks.

tsfai 發表於 2012-6-28 09:25

                               
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Ching,
After balance charge, my 2S new lipo gets 8.31v only? Charger shows 8.4V but voltmeter shows ...

Either your charger or your voltmeter is not accurate.  Did you measure the voltage after the charging was completed or while the pack was still connected to the charger?

Allan007 發表於 2012-6-28 09:47

                               
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Either your charger or your voltmeter is not accurate.  Did you measure the voltage after the char ...

Allan Hing,

I did both - while charging and immediately after the charger shows full. I also measured it both while it was connected to charger and then disconnected from the charger right after the charge completed - both readings from the voltmeter read 8.31V. The charger is new too, bought in less than one week. The lipo pack was played for 2 times only and each time it discharged(started at ~ 7.89v) when doing storage after playing so difinitely it was not over discharged in playing.

I am pretty sure the voltmeter is quite accurate as I have a power supply which reads 13.8V on its display and the voltmeter shows 13.8V too.

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Fai Hing,

If your packs are new, they shouldn't drop from 8.4V to 8.31V within a short period.  My guess would be you charger may not have really fully charged the pack.  The 8.4V may include the real internal voltage (8.31V) and the voltage drop (0.09V) across the cells due to the final charging current.  Once you have disconnected the charger, the charging current is interrupted and the 0.09V vanishes.

A good charger should have a very very small final charging current so the 8.4V can be fully "plugged" into the pack.

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Allan Hing,

Thanks for your comment. I just returned back to RC world after 8 years.
I did an experiment and probably it is the battery problem.
I have 2 new lipo chargers - one AC/DC max 6A and the other 20A - both bought within one month. I have 2 new 4200mAH 40C lipo packs bought within one month as well. After storage, both packs can only be fed with less than 2000mAH with balance charge. Previously I used the 20A one and the final vlotage was 8.31V after a while from completing the charge. I just balance charged the 2 packs this afternoon with the 6A one and they both showed ~8.31 - 8.32V after a while from completion. Both chargers gave out the similar(but not 8.4V) final voltage after full charge.  I set 4.8A to charge in both chargers. What a disappoinment? Maybe the chargers and the lipo packs are all bad....