I have researched to the point of confusion ….. My question is …
What are people using in the way of batteries on a total loss ignition system
If using a li-po battery is it better to have :-
* A single 4S 5500mah 14.7v ,
* A pair of 3S 4500mah 7.2v in series
*Or forget the lipo and run NiMH batteries
*Or forget all of the above and just run a 12v lithium ion bike battery
*Or forget everything and buy a stock Honda :D
Comments9
Re: batteries
A single 4S 5500Mah would be ur lightest option. U could use a pair of 2S 4500Mah (if u wires 2 3S in series u'd have a 6S 22.2V battery)but i really doubt u'd need that much capcaity also adds complexity to the system.
I'm using a 3S 6800Mah Li-po and generally use about 1200Mah for a whole days running, which is mainly for running the external water pump on the Gas Gas.
I wouldn't touch Ni-Mh they are a old technology and weigh far too much compared to a lithium option.
Re: batteries
Re: batteries
Re: batteries
Use the ask Sam section
[/quote]
He will say take option 5 - Stock honda
Re: batteries
[quote author=PIL007 link=topic=2296.msg25305#msg25305 date=1392324419]
Use the ask Sam section
[/quote]
He will say take option 5 - Stock honda
[/quote]
There is no need to make life anymore difficult than needs to be, Stock Honda only requires a battery for the rain light. ;)
Re: batteries
There are three types of "lithium" batteries..
Lithium polymer - (Lipo) Soft case, they are the lightest for a given power but more delicate and harder to manage. They are a favourite for model airplanes because of the light weight. They need special chargers and careful use to avoid puffing up or bursting into flames
Lithium Ion - (Lion) hard case, more rugged and heavier. They will explode if overcharged. As used in laptop computers
Lithium Iron Phosphate - also called Life, Lifepo4, A123 etc. These are the latest and used in high end power tools. More abuse resistant, charge tolerant and safer to charge and use.
Note that all lithium batteries are sensitive to overcharge to varying degrees but then, most batteries are. More importantly though, these batteries also have a low voltage limit where damage occurs if exceeded. Run them flat once and they will be useless. All of our electronics like phones, drills etc. include protection circuitry to prevent over/under charge. When used as bare cells, you will need to be very careful ot to run the battery to low (Less then 8 volts) or flatten it.
I recommend the newest Lifepo4 cells. A 4 cell pack is perfect for use in 12 volt applications and will actually charge directly from a charging system if you have one or standard ‘smart’ chargers. I use these cells as auxiliary batteries in all my race motorcycles at a substantial weight savings over lead acid batteries. There are dedicated 'smart' chargers available that also balance the cells as they charge and then maintain optimum voltage rate until used. You still have to avoid discharging below 8 volts or damage will occur rendering the battery useless.
Re: batteries
Unlike the Ni-MH batteries lipos don’t like being discharged 100% the minimum sell voltage is 3.0V but most manufacturers recommend not discharging each cell below 3.4V
As a disclaimer and a warning, the specifications of the battery manufacturer should always be followed, and generally speaking, they say 3.0V. In fact, most chargers will refuse to operate if the static cell voltage is less than that.
Charging a 5000mah 4s lipos with 20c discharge rate should only be charged at 1C or 5 amps
4000mah would be 4 amps
I have seen expensive packs killed after one use because there was no way of monitoring the cell voltage,
One of these [url=http://www.hobbyking.com/hobbyking/store/__4176__HXT_Lipo_Monitor_4S_A_must_have_for_all_lipo_users_.html]http://www.hobbyking.com/hobbyking/store/__4176__HXT_Lipo_Monitor_4S_A_must_have_for_all_lipo_users_.html[/url]
could save your lipo from destruction and possible fire from simply giving you a low voltage warning letting you know it’s time to charge the pack before it drops below the 3.4 V per cell. Most RC Toys these days use a BEC “Battery Elimination Circuit “ these cut the power to the motor once a low voltage has been detected but can allow power to your controls to land or steer to safety
Lipos are widely used in RC car racing that have hard cases or covers
Something like this would be a good start
[url=http://www.hobbyking.com/hobbyking/store/__19499__Turnigy_5000mAh_4S1P_14_8v_20C_hardcase_pack_AUS_Warehouse_.html]http://www.hobbyking.com/hobbyking/store/__19499__Turnigy_5000mAh_4S1P_14_8v_20C_hardcase_pack_AUS_Warehouse_.html[/url]
Re: batteries
Re: batteries