how long to charge a battery?

3 posts   •   Page 1 of 1
User avatar
The Baron 50
Junior Pilot
 
Posts: 56
Joined: Wed Jul 15, 2009 3:10 pm
Location: Pyrenees France
Website: http://www.maison-basque.com

how long to charge a battery?

by The Baron 50 » Thu Aug 06, 2009 7:37 pm

with my 'bee, I can fly for about 7 mins then the battery (3 cell as factory supplied) goes flat. putting it on charge the green light flashes for over 2 hours, I read that the max time on charge should be never more than 2 hours. How long should a charge take? Also 7 mins flying for 2 hours charging??? is that normal? Will be very grateful for any experiences on this. Ta in advance, keith
Kalt Baron 50 - back in the air
Lama V4 - retired
Honeybee King 2:
CNC head & tail set
3400 Brushless motor &35A ESC
43t tail pulley
Telebee gyro & Acer labs tail servo
Schluter Mini-boy (mothballed)
Been flying for 40 years

User avatar
ringding
Fleet commander
 
Posts: 838
Joined: Sun Feb 03, 2008 3:46 pm
Location: Blackpool, UK
Website: http://www.textvertising.co.uk

by ringding » Thu Aug 06, 2009 9:05 pm

That sounds about right to me. But it's been a while - now I use a proper charger!

The problem with the e-sky chargers is that they only output 800mA if I remember and the battery is more than that (1000-1200mAh ish?). This means that it's being charged at less than "1C". A battery of any capacity charged at 1C will normally take less than 2 hours to reach peak voltage. (1C is the rating of the battery in mAh. so if you charge a 1200mAh pack at 1C your charger would need to output 1200mA.)

Just ensure you do not charge the battery immediately after flying - leave it half an hour or so or it will be dead in no time.

However, 7 mins is pretty good on a standard pack. I get appx 9-12 on a 2200Mah pack buzzing about - and thats double yours!

My 2200 Mah pack used to take 4 1/2 hours on an Esky charger! Normally they say 2 hours maximum as this would indicate a problem with a cell not reaching peak voltage. But if your charger output is less than the battery mAh rating then 2 hours or thereabouts is about right.

Hence why I have gone back to flying Nitro :lol: Fuel n go
Carbon TT Raptor
HK450TT Pro & Trex 500 Airwolf
Blade MSR & SR120
FPV kit on Skywalker II & Gaui 330xs
DX8 & Futaba FF9
http://www.youtube.co.uk/rcsquad

User avatar
The Baron 50
Junior Pilot
 
Posts: 56
Joined: Wed Jul 15, 2009 3:10 pm
Location: Pyrenees France
Website: http://www.maison-basque.com

how long do you charge a battery

by The Baron 50 » Fri Aug 07, 2009 1:33 pm

Cheers ringding, I thought it would be about right, never mind, that's the way it goes with electric. Like you I fly nitro (baron 50) but am waiting to get hold of a new main gear hence the HBK 2. I have been grounded since early June :( , gears are like hen's teeth but may have found one in the US. :D regards, Keith
Kalt Baron 50 - back in the air

Lama V4 - retired

Honeybee King 2:

CNC head & tail set

3400 Brushless motor &35A ESC

43t tail pulley

Telebee gyro & Acer labs tail servo

Schluter Mini-boy (mothballed)

Been flying for 40 years

3 posts   •   Page 1 of 1

Who is online

Users browsing this forum: No registered users and 0 guests