BATTERES&CHARGERS

Battery technology is constantly evolving, but this should be a good introduction into batteries and chargers used for multi-rotor helicopters. Only LiPo batteries will be discussed as they offer great energy storage-weight ratio and endlessshapes at an affordable price. Recommendations forbatteries can we found at the bottom of the page.

Battery Basics:

LiPo batteries can catch fire or explode during charging, so we strongly recommend that you use a bag or container specifically designed for charging batteries.
LiPo batteries typically last 300-400 charging cycles with proper care.
Over-discharging significantly reduces a battery's lifespan. We recommend leaving at least 20% charge to be safe.
Heat can also reduce a battery's lifespan. Do not leave batteries in hot areas or in direct sunlight. A battery should not become hotter than you can hold it with your bare hands (even during flight).

1) Number of Cells (S-rating):

LiPo batteries consist of one or more cells. Batteries with one cell are labeled as "1S"; with two cells it will be labelled as "2S" and so on, all the way up to 12S. The "S" indicates that the cells are connected in series. (P indicates that they are connected in parallel) Each cell has a voltage of 3.7 volts. Since they are in series, you can easily calculate the total voltage by multiplying the number in front of the S by 3.7V volts (ex. 3S = 3*3.7 volts = 11.1 volts). It is important to know what S-rating your motor/ESCs (Electronic Speed Controller) combination and Controller Board requires.

2) Capacity (mAh):

The higher the capacity, the more power will be stored in a battery. A higher capacity (mAh) means longer flying time, but the relationship is not linear, as batteries with greater capacity get heavier too. A good range for quadcopters and multi-rotor helicopter would be 2200mAh to 5000mAh. This range will give you enough flying time without additional weight significantly affecting performance.

3) Discharge Rate (C-rating):

This number indicates how fast the battery can be discharged safely. The maximum sustained load is calculated by multiplying the C-rating by the battery's capacity. A 3300mAh battery at 45C would be able to draw a maximum of 14.85A (3300mAh*45/1000). You can also use the C-rating to calculate flying time in minutes under maximum load (in this case 14.85A) by dividing 60 by the C-rating (60/45=1.33 minutes). Although you will get really short flight times, do not worry since the calculation is based on how it operates under the maximum load and it is unlikely you will reach that load.

So why do we care about the C-rating? The C-rating also helps to determine how much "punch" your quadcopter will have. A higher C-rating is always better and we recommend that you stay above 25C. At least 35C-45C when carrying loads and 45C+ if you would like to perform performance aggressive maneuvers (stunts). Just remember that a higher C-rating allows you to fly more aggressively and does not hurt your battery life if you do not fly aggressively.

Other factors to consider:

Connectors:

Many batteries (and chargers) do not come with connectors, in which case you would have to solder them on your own, but some do, so it might be convenient to buy batteries with the connector system that you are already using.

There are a ton of different connectors. The most common are Deans Connectors, EC3/EC5 Connectors, JST Connectors and XT-60 Connectors. We use XT-60 connectors exclusivey for 2000mAh+ batteries due to the secure connection they provide (they can sometimes be a little bit of a pain to disconnect, but it also means that they are unlikely to disconnect during flight), they are cheap and are rated for 65A of continuous load. We use JST connectors for small batteries (with low load) due to space and weight savings they provide. What connector you ultimately decide on is often a personal preference, but make sure that the connector is rated for what you need. Always disconnect connectors, by pulling on the connectors and not the wires attached to the connectors.

Swollen (Puffed) LiPo Packs:

LiPo batteries can experience swelling, deformation or become puffed due to excessive heating. Batteries' internal resistance increases as batteries age (or if damaged during a crash), which in terms causes excessive heat and puffing. A battery that is deformed is probably at the end of its life cycle and should be properly disposed of. Some claim that swollen batteries are safe as long as the swelling dissapears as the battery cools. We would rather not risk a sudden explosion and never use a swollen battery. A swollen battery is easy to identify as the shape will be deformed and the battery itself will no longer feel firm.

Disposing LiPo Batteries:

LiPo batteries are non-toxic and can be disposed in your trashcan. Make sure that they are fully discharged and submerged in saltwater first. See full instructions here.

Recommended Batteries and Chargers:

Batteries:

Multirotor pilots usually choose to fly etiher 3S or 4S LiPo batteries. You should only use 3S LiPos if you wish to connect your Quadrino controller directly (use a BEC if you wish to fly with Quadrino and 4S batteries). The Naza controller comes with a separate BEC unit and can handle both 3S and 4S LiPos. We recommend starting with a 3S 3300mAh for quadcopters and 4S 3300mAh for Hexacopters. Remember that smaller batteries are not only cheaper, but also cause less damage in a crash and makes the multirotor more nimble due to the reduced weight. Start small and build up.While you are professional aerialplane player,recommend chooice high capacity batteries for a longer flying experience.Like 8000mAh,10000mAh,16000mAh,20000mAh.

These batteries are available in the store:

ONBO 3S 3300mAh 45-90C LiPo Battery
ONBO 4S 3300mAh 35-70C LiPo Battery
ONBO 6S 8000mAh 25-50C LiPo Battery
ONBO 6S 16000mAh 20-40C LiPo Battery
ONBO 6S 16000mAh 25-50C LiPo Battery
ONBO 6S 20000mAh 20-40C LiPo Battery

Chargers:

Premium Digital Chargers (power supply not included):

~$110 iCharger 206B 300W S1-8S

~$25 IMAX B6 Charder/discharger S1-S6

At What Battery Level Should I Stop Flying?

The general rule states that you should only drain your battery 80% to ensure long battery life. Take your fully charged battery and fly your multirotor as you normally would for exactly five minutes. Recharge this battery and note how many mAh is needed for a full charge. Divide the mAh by five minutes and you get the mAh/min that you normally use. Divide 80% of your battery's mAh by the calculated mAh/min and you have your standard flight time.

For Example:
80% of your 3300mAh battery is 2640mAh.
After the 5 minute flight your charger added back in 1000mAh.
1250mAh/5min = 250mAh/min used
2640mAh / 250mAh/min = 10.56 minutes of flight time.

Some OSDs provide how many mAh you have used, but most battery alarms/monitors only give you the battery voltage. We usually reach our 80% drain when the voltage drops to 3.2-3.5V per cell (9.6-10.5V for a 3S LiPo and 12.8-13.5V for a 4S LiPo). This is only an estimate and depends upon the multirotor, batteries etc. You should measure the mAh instead of voltage for an more accurate estimate.Mail:sales02@onbo-power.com

References:
RC Helicopter Fun
Battery University

BATTERES&CHARGERS

Wednesday 28 May 2014

ONBO LIPO 22000mAh 22.2V 6S 25C FOR MULTICOPTERS/MULTIROTOT/AERIALPLANE

ONBO 16000mAh 22.2V 6S 5S 4S 25C 35C are in stock

ONBO Aerial aircraft batteries Recommend

Tuesday 27 May 2014

2014 ONBO CAR JUMP STARTER

BATTERIES&CHARGERS