Oset Batteries Lithium (LiPo) Conversion Directions

[8690q]

Sounds like 4 5s batteries is the way to go to keep the wee bike standard.

If i wanted to go up to 6s I'd have to wait for him fitting a 20 oset or changing all his electrics to suit 48v ?

I would love to try the 36 on 48 though just to see, you know. Could end in expensive tears though if the smoke happened.

[gwhy]

if you did run a 36v on 48v I think it will be ok as long as you keep a eye on the motor and controller temps but I think it may be fine as long as the rider is only light , bu tlike you say it can work out expensive as you will need a set of 6s and a set of 5s , a good way of just giving it a quick go would be to use the sla's and just put another sla in the circuit it will work out much cheaper than buying a set of 6s just to try. But to be honest I think the 5s setup will keep your lad happy for a little while as it will be much better over using the sla's.

[8690q]

So being a skinflint I've already noticed the 5000mah batteries are among the more expensive ones.

What would I need to do to use a lower mah battery like a 4000mah. Use more ?

[8690q]

What about the discharge rate ? I've saw some as low as 15c and others up at 60c. Are the 15c suitable ?

[gwhy]

you can use as low as 15c rate for the osets but i think the price diffence is not even worth mentioning between 15 and 20c so I would go for 20c as a minimum. if you went for 4000mah then this will make up a total 8000mah battery and most people like to run a minimum of 10000mah

so yes you will need more 4000mah batterys. the more mAh overhead you have the better it will be for the life of the batterys e.g a 15ah battery will have more charge cycles than a 10ah battery when use on the oset lipos should be discharged down to around 20% of there total capacity for maximum charge cycles so even the initial cost is a little bit more it can actually be more cost efficient in the long run,

[8690q]

I've spoke to my mate who flys rc helicopters and planes.

He has all sorts of lipos and stuff. The batteries he has most of are 4000mah with 15c all matched.

What will the difference in use be with the 15c ?

I'm assuming I can just make it two blocks of three to get amps then string them together to give the voltage.

This is free batteries to try so anything is possible really.

[gwhy]

15c will be fine and there will not be any difference in use on the oset so if you can get free lipos to play with then all is good , yes you can put 3x 5s 4000mah lipos in parallel to make a 5s 12000mah battery then put 2 of these in seris to make the 10s ( 36) 12000mah battery then you will be good to go. also remember that you can not really mix different battery's if they have different capacity's ( ah's) or if you do then always use the lowest capacity battery as the maximum size of any other battery' capacity, hope this make sense

[8690q]

You have been such a help man and I think I'm nearly there for getting the right battery setup. Your some guy.

If I only rigged 4 up and got 8000mah it wouldn't last as long as it would with 12000mah ? Would it last longer than the sla's ?

Once I have the batteries I'll be asking all sorts of questions about connectors and the like.

[gwhy]

Thanks for the kind words.

The more Ah's you get the longer running time the bike will have, a 8000mAh (8Ah) 10s (5s + 5s)lipo will prob last as long as a 10Ah sla and a 16000mAh (16Ah) lipo will last 2x as long as the 8000mAh (8Ah) lipo.

[8690q]

I couldn't wait to ask this as I'm already looking at parts and other possible charging setups. It's like christmas !

I use deans connectors on all my radio controlled stuff and I'm guessing the lipos from my mate will have deans on them as well. Will these be okay ?

I've been reading up on parallel charging, seems the way to go ? None of my current chargers seem up to it so would need a charger to suit. I thought a multi charger would be best but can't find one with a built in power supply, all seem to need a seperate unit bought so looked into parallel charging using a single out charger with a parallel charge/balance board.

Edited March 19, 2013 by 8690q

[gwhy]

deans connectors are ok and will work but they are not the best connector for the environment on a bike , they are a little bit small. I use a combination of 4mm shrouded plugs and 6mm shrouded plugs.

http://www.hobbyking.com/hobbyking/store/__9283__HXT_4mm_Gold_Connector_w_Protector_10pcs_set_.html

I use these to make adaptors for the standard 4mm connectors that come with the batterys but all my main connectors are these http://www.hobbyking.com/hobbyking/store/__20353__HXT_6mm_Gold_Connector_w_Protector_10pcs_set_.html

on HK you can buy ready made up adaptors that use 10awg wire and xt90 plugs and sockets which is more than enough for the small osets ( I use 8awg wire for my bikes )

parallel adaptors

http://www.hobbyking.com/hobbyking/store/__25662__XT90_Battery_Harness_10AWG_for_2_Packs_in_Parallel.html

serial adaptors

http://www.hobbyking.com/hobbyking/store/__25661__XT90_Battery_Harness_10AWG_for_2_Packs_in_Series.html

you would need to change the plugs on the battery's to these

http://www.hobbyking.com/hobbyking/store/uh_viewitem.asp?idproduct=24709

and you would also need to fit a plug to match for your charging leads http://www.hobbyking.com/hobbyking/store/__24708__Nylon_XT90_Connectors_Male_5pcs_bag_.html

I don't know what chargers you have at the moment but if they can charge upto 6s then these will be fine you can use them for parallel charging I use 2 of these for my basic charging requirments http://www.hobbyking.com/hobbyking/store/__7028__Turnigy_Accucel_6_50W_6A_Balancer_Charger_w_accessories.html

total charging time for a 10Ah battery using the 2 chargers is around 3 hours. yes they need a psu to power them but these can be got for around 6 quid each from fleabay something like this

http://www.ebay.co.uk/itm/15V-5A-FOR-TOSHIBA-TECRA-M5-M6-M7-M8-A1-A2-A3-A4-A5-A8-A9-AC-ADAPTER-CHARGER-PSU-/160873838084?pt=UK_Computing_LaptopAccessories_PowerSupplies&hash=item2574d3f604

but dont forget to also get a power lead !.

once you have paralleled you batterys using the parallel adaptor these can remain connected and treated as 1 battery and you charge this battery through the parallel adaptor, you can also get a parallel adaptor for the balance taps http://www.hobbyking.com/hobbyking/store/__27079__JST_XH_Parallel_Balance_Lead_5S_250mm_2xJST_XH_.html

[8690q]

Thanks for the connector info, top stuff again !

These are the two chargers I own, not sure if they're up to the job but I don't mind buying a new charger if need be.

http://www.ebay.co.u...=item27bf30a703

http://www.ebay.co.u...=item2c5d8199f9

Can parallel balance leads be bought ? I'm looking to have 1 balance plug and 1 charge plug per bank of 3 batteries. I have seen balance boards but I'm trying to make this as fuss free as possible to charge.

Edit : I missed the bit at the bottom of your last post about the balance leads sorry !

Do I need one with 3 plugs into 1 for each pack of 3 ?

Edited March 21, 2013 by 8690q

[gwhy]

Edit : I missed the bit at the bottom of your last post about the balance leads sorry !

Do I need one with 3 plugs into 1 for each pack of 3 ?

yes you wil need a 1 into 3 ideally but hk do not do a off the self lead so you could get a 1 into 6 and tape up the unused balance plugs

http://www.hobbyking.com/hobbyking/store/__27074__JST_XH_Parallel_Balance_Lead_5S_250mm_6xJST_XH_.html

Yes your charges will do the job, so you are going to have 3X 5s 4000mah battery's connected parallel and treat this as 1X12000mah battery ? then series 2 of these together to make up the 36v

[8690q]

Awesome, getting there now !

The only thing I can think of the now is that if I've got chargers that will only do up to 5amps charge for my 5000mah 3s packs how do they deal with 12000mah ?

Would I just max the timer and mah limit on the chargers ?

[gwhy]

it will just take longer to charge so you you will need to set the max ah charge safety limit to 12ah and set the safety timer for around 200mins, the charge rate for 5s with a 50w charger will be around 2.8A max so this will means that a total charge for flat should take around 4hours for 12ah ( but it will be more like 3-3.5hours)

edit: your 3s can charge at a max of 4.5A with a 50W charger ( the higher the wattage charger the faster the batterys can be charged )

Edited March 21, 2013 by gwhy