7 V+2.5A Charge,am i right ?
04-24-2014, 11:00 PM
#2
Senior Member
"7 V Li with 5500 mAh 35c with charging current 2.5A ,is it right?"
Not as far as I'm concerned.
A typical 5500mah Lipo rated at up to 35C can be charged at a rate of 5.5A
Some Lipos have the ability to be charged at higher rates, usually 2C to 5C
2C 11A, 5C 27.5A
Obviously, the charger must be capable of providing the higher charge rates.
A typical "7" v lipo has 2 cells in series, so I'll use 8V.
the 1C rate at 8V (W=IE) is 44W (50W + Charger)
2C (obviously) is 88w (100W + charger)
5C is 220 W (> 200W charger)
My chargers are rated at 50W, 80w x 4, and ~1300W x2
The first two are AC/DC, and the third requires external DC power, (up to ~40A per port)
You may want to take note of the following cell voltages
3.2V charge depleted (Do not discharge below this value) It's also about the minimum safe voltage when the lipo is loaded.
3.85V Storage, 50% of charge remaining (Safe for long term storage)
4.0-4.1v ~90% charge, some use 4.1 as the charge cutoff voltage to increase battery life
4.20V ~100% charge Maximum safe voltage for "standard" lipos.
Above 4.3V Danger, Charlie Brown, Smoke, fire, etc. and a ruined battery are quite likely.
Also, remember that standard pocket DVMs, battery checkers, chargers, and whatnot
may not be as accurate as you might think.
Not as far as I'm concerned.
A typical 5500mah Lipo rated at up to 35C can be charged at a rate of 5.5A
Some Lipos have the ability to be charged at higher rates, usually 2C to 5C
2C 11A, 5C 27.5A
Obviously, the charger must be capable of providing the higher charge rates.
A typical "7" v lipo has 2 cells in series, so I'll use 8V.
the 1C rate at 8V (W=IE) is 44W (50W + Charger)
2C (obviously) is 88w (100W + charger)
5C is 220 W (> 200W charger)
My chargers are rated at 50W, 80w x 4, and ~1300W x2
The first two are AC/DC, and the third requires external DC power, (up to ~40A per port)
You may want to take note of the following cell voltages
3.2V charge depleted (Do not discharge below this value) It's also about the minimum safe voltage when the lipo is loaded.
3.85V Storage, 50% of charge remaining (Safe for long term storage)
4.0-4.1v ~90% charge, some use 4.1 as the charge cutoff voltage to increase battery life
4.20V ~100% charge Maximum safe voltage for "standard" lipos.
Above 4.3V Danger, Charlie Brown, Smoke, fire, etc. and a ruined battery are quite likely.
Also, remember that standard pocket DVMs, battery checkers, chargers, and whatnot
may not be as accurate as you might think.
