Model Boat Mayhem
Technical, Techniques, Hints, and Tips => Batteries & Chargers => Topic started by: tugboattam on June 11, 2013, 06:26:17 pm
-
Iam starting work on a small tug (18"x6") I would have like to put a 6v 4.5ah jelly cell in it but due to size restrictions I can't. I can fit a 5 cell 6v 2600mah in, can I charge this from my 6v jelly cell charger ? also how will this compare speed wise and duration of run time ? Thanks in advance. Ian.
-
Sorry no you can not charge a nimh with a gell cell batt you will need the right charver for it...as for run times it depends on your hull shape motor size prop size more info needed please
Dave
-
Hi Dave, its just a small tug boat hull so not very areodynamic, the motor looks about the same size as the one in my Seaport, a 380 maybe, there are no markings on it. It has a a prop shaft and rudder fittrd but no prop.Im afraid thats all the info I can give you about it, my real ignorance is I have no idea how the 6v 2600mah nimh would compare to a 6v 4.5ah jelly cell, would I maybe need to go higher say a 6v 4000mah ? Im pretty useless when it comes to understanding batteries. ian.
-
Obviously a 2600minh would have less of a running time than a gell cell of 4.5 amps so a 4000nimh would be closer to the mark BUT without the spec of the motor and knowing how much current it draws it is difficulty to hazard a guess....but a speed 400 will draw 4amps so a rough ball park figure and I will stand corrected on this would last an hour on a 4000nimh batt
Dave
-
Hi tam.
pic to go with PM sent.
frank
(http://imageshack.us/scaled/landing/11/s5000147.jpg)
-
A 380 might be a bit much for an 18" tug anyway.* A 285 might fit and, depending on the combination of voltage that the motor can handle and what the battery can supply, could give a run time over an hour.
And a proper NiMH/NiCad charger is cheaper than the same charger and a replacement new battery. After the SLA charger has killed the NiMH, a new NiMH will be needed.....
*unless its a springer, but that would take the SLA anyway.
-
Hi, Thanks for all your replies, Im slowly begining to understand how all these batteries function. I think now that I will junk the motor and go for a 9.6v battery as I have already got two of these battery packs + charger.
Frank, thanks for the offer of the battery charger but as the above says I may now go down a different route, though the offer was much appreciated.
Can anyone tell me what SLA stands for ?
-
Sealed lead acid aka gel cell
Ned
-
DOH !!!!!! :embarrassed:
-
A 385 would be OK on 6v. It's the five-pole version of the 380 and much less fierce. http://http://mfacomodrills.com/motors/385.html (http://http://mfacomodrills.com/motors/385.html)
DM