Model Boat Mayhem

The Shipyard ( Dry Dock ): Builds & Questions => Seaport Tugs => Topic started by: DickyD on January 28, 2008, 08:19:33 pm

Title: What Battery
Post by: DickyD on January 28, 2008, 08:19:33 pm

Can someone who has altered the Seaport Workboat tell me what battery you have used i.e. lead acid, what size ?  :-\

Title: Re: What Battery
Post by: offshore1987 on January 28, 2008, 09:49:49 pm

I have not got one but from what i have seen they use 6v 4ah batterys  O0

all the best

Title: Re: What Battery
Post by: portside II on January 28, 2008, 10:28:20 pm

same here Richard , 6v 4ah sla battery ,removable sit's on the tank in the bilge and can be removed  with ease.
daz

Title: Re: What Battery
Post by: DickyD on January 29, 2008, 09:20:16 am

Thanks chaps.  O0

Any idea of the run time ?  :-\

Title: Re: What Battery, Run time & Charging
Post by: DickyD on January 29, 2008, 10:25:37 am

Am I right in thinking that a 4Ah battery charging at 500ma will take 8 hours to charge ?  :-\

Brain wont work. :embarrassed:

Title: Re: What Battery
Post by: Colin Bishop on January 29, 2008, 10:49:08 am

In theory yes but if it's a Gel cell then it shouldn't be more than half discharged anyway so recharging time should be less.

Title: Re: What Battery
Post by: tolnedra on January 29, 2008, 11:03:10 am

Same here Richard, 6volt SLA, 4ah, seems to run forever, so far!

Danny

Title: Re: What Battery
Post by: DickyD on January 29, 2008, 11:22:22 am

Thanks chaps thats what I wanted to know.  O0

Title: Re: What Battery
Post by: Faraday's Cage on January 29, 2008, 01:13:19 pm

Quote

Am I right in thinking that a 4Ah battery charging at 500ma will take 8 hours to charge ?]

DD,

A gel cell charges at contant voltage but the charging current drops as the voltage comes up to the point where once the gel cell is charged - the current is only a few milliamps. 20mA would be a typical figure. Therefore the usual current verses time calculation used for ni-cds etc. doesnt apply here.  Its safe to the leave the correct charger on charge for the aforementioned reason. (Thats how a security alarm charger works).  Also, its not a good idea to run a gel cell until "flat" as it will difficult to recover the battery from this state especially if left until next time its required.

FC

Title: Re: What Battery
Post by: DickyD on January 29, 2008, 02:51:52 pm

The battery is a SLA 6v 4Ah  FC. O0