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>> Home > Forum > Electrical Related > Which type of battery?
Which type of battery?
(627 views)
Author Message
stevethomas
(Sub-Lieutenant)





Forum Posts: 18
19th Oct 2016 16:51  
>> Permalink
mdlbt.com/23986

Hi guys, please can I have your views on battery types I should use please.
I am in the process of refurbishment of a billings white star which is only a small boat with a 3 to 7.2 volt motor in it and a viper marine 15 ESC. I have a couple of NiMH 9.6 volts 8 cell batteries and a NiMH 7cell 3000 mah battery. Are any of these OK to use or should I be looking at lipol batteries and if so what size?

Thanks
Steve

Haverlock
(Fleet Admiral!)





Forum Posts: 403
19th Oct 2016 22:10  
>> Permalink
mdlbt.com/23990

Your 7 cell NiMh will work you may overvoltage the motor ( slightly) but should be ok for pottering around. A 15A ESC limits what you can do. Unless you want to rip out the power plant and ESC consider buying a 6 cell MiMh ( rc car) battery pack.


"that's not a bug its just an undocumented creature."

Sir Terence David John "Terry" Pratchett, OBE (28 April 1948 - 12 March 2015)
stevethomas
(Sub-Lieutenant)





Forum Posts: 18
22nd Oct 2016 11:57  
>> Permalink
mdlbt.com/24029

Sorry its taken a few days to reply but spent a few days in bed with an inner ear problem. Any idea what size motor and ESC
I should go for ? the motor that's is in the boat is a MFA RE 380.

Many Thanks
Steve

Haverlock
(Fleet Admiral!)





Forum Posts: 403
22nd Oct 2016 22:10  
>> Permalink
mdlbt.com/24032

if your replacing the motor and esc then ignore my previous post.

You may consider this

http://www.cornwallmodelboats.co.uk/acatalog/HYDRA15COMBO.ht...

your 7 cell pack would work fine just get a watt meter so as to check current drawn with various props.


"that's not a bug its just an undocumented creature."

Sir Terence David John "Terry" Pratchett, OBE (28 April 1948 - 12 March 2015)
Dave M
(Fleet Admiral!)





Forum Posts: 1351
23rd Oct 2016 00:37  
>> Permalink
mdlbt.com/24034

Hi Steve
I have a Billings White Star that I restored some years ago. If yours is like mine then it will most likely be on the heavy side for the size of the model. A 380 motor with a 30mm 3 blade brass prop powers mine. I have a small Action 10amp esc and homemade BEC. To reduce weight I cut a 7.2 NiCad pack into two sticks and joined them with a soldered length of wire across the bottom end. This allowed me to place the batteries either side of the prop shaft. My rudder servo is over the propshaft in the stern. Correct ballasting can be achieved by moving the batteries fore or aft.
Any small 15 amp ESC would be suitable and most now have a built in BEC. The main consideration needs to be weight and size.
I agree with Haverlock's suggestion re a Wattmeter if you intend to use the higher voltage batteries with the existing motor.
Its a small boat that sails well, but on my club sailing waters it is a fair weather sailor.
Good luck
Dave 😀


Live long and prosper

Dave
stevethomas
(Sub-Lieutenant)





Forum Posts: 18
23rd Oct 2016 13:01  
>> Permalink
mdlbt.com/24035

Thanks to Haverlock and DaveM for your help and advice, all taken on board and made a note of. Thanks guys.
Steve.