A realtively good cost for the 20Ah LiFE cells can be found at http://www.batteryspace.com/LiFePO4-Prismatic-Box-Battery-12.8V-20Ah-256Wh-10C-rate-without-PCM.aspx. The plastic case contains four 20Ah cells and does not come with a battery management system. Many guys in the model warship world are using these cells with a simple balancer found at http://www.batteryspace.com/Smart-LED-Balance-Module-for-3.2V-LFP-Cell-with-250mA-Balance-Current.aspx. One balancer across each cell helps keep the cells balanced to each other without limiting the output current. The cells themselves are good for a continuous 200 amp draw. I switched my combat ships to these cells (and the Headway cylindrical 10ah cells for smaller ships) a couple years ago and have never looked back. Half the weight and more capacity than a similir sized SLA, longer cycle life, and they don't dump voltage under load. My ships can battle all day on one charge ... heck, I don't even take a charger out to the pond anymore. Wish I could make it up for the upcoming battle. T81 is still awaiting its time on the building schedule to get remotered. SV15 is even further down on the schedule requiring a total rebuild from the suspension up. Lastly the semi-secrete tank project is stalled as other higher priority projects compete for time. Still, the goal is to have all three assets operational by the 2014 Spring Battle. :) Mike M
From: Derek Engelhaupt <[email protected]> To: [email protected] Sent: Friday, September 20, 2013 9:12 AM Subject: Re: [TANKS] Re: Battery find Under normal conditions the motors don't pull 30 amps, but I have blown a 30 amp fuse on the Sturmtiger using the same motors. 18AH batteries are sufficient using SLAs for most tanks. I'm just really not sure about what size LIFEPO4 battery pack I should use. I was demonstrating the KV-2 to some people that visited us and the two 7AH batteries got really hot. One was so hot that it started to bulge so I really need to find a sufficient battery pack for this beast. I was thinking that the 20AH packs would be sufficient to power it. Problem with going over 20AH is price. Derek On Fri, Sep 20, 2013 at 7:30 AM, isaac goldman <[email protected]> wrote: Max discharging current : 30 Amps. > > >If you happen to pull more than 30 amps total the battery will shut down on >you. Your going to want to make sure running both drive motors doesnt pull >more than that... > > > >On Fri, Sep 20, 2013 at 7:56 AM, TyngTech <[email protected]> wrote: > >I would say that on this unit, the BMS is integral to the case. I don't see >any connectors or wiring that would indicate an external BMS unlike this >sellers 15AH solution. >> >> >>http://www.ebay.com/itm/24V-15AH-LiFePo4-battery-Lithium-Electric-Bicycle-Scooter-Rechargeable-Battery-/221280643607?pt=US_Rechargeable_Batteries&hash=item33855aaa17 >> >>Steve >> >> >>On Friday, September 20, 2013 4:52:59 AM UTC-4, Neil Rochford wrote: >>Cant grumble at the price, I`ve been looking at something like this for my >>e-bike that I can also use in my tank. Im just a little concerned about >>reliability of a technology I dont understand, Does the BMS come part of the >>battery box ( integrity built in ) or does it require finding a home in the >>tank somewhere ?. >>>Think how much weight would 2 X 12v SLA 20AH be ? compare that to 4.8kg >>>wonderful stuff imo.but remember I know nothing 8) >>> >>> >>>Neil >>> >>> >>> >>> >>> >>>On Thursday, September 19, 2013 8:59:16 PM UTC-7, [email protected] wrote: >>>What do you guys think of this one? Kind of a nice setup with a voltmeter, >>>on/off switch, quick disconnects, charging port, and a charger. All in a >>>nice neat package. I'm looking at it for the KV-2 so it will fit in that >>>tank. It's about 7"x3"x10" from my quick calculations. >>>> >>>> >>>>http://www.ebay.com/itm/321207262810?ssPageName=STRK:MEWAX:VRI&_trksid=p3984.m1423.l2661 >>>> >>>> >>>> >>>>Derek >>-- >>-- >>You are currently subscribed to the "R/C Tank Combat" group. >>To post a message, send email to [email protected] >>To unsubscribe, send email to >>mailto:rctankcombat%[email protected] >>Visit the group at http://groups.google.com/group/rctankcombat >> >>--- >>You received this message because you are subscribed to the Google Groups >>"R/C Tank Combat" group. >>To unsubscribe from this group and stop receiving emails from it, send an >>email to mailto:rctankcombat%[email protected]. >>For more options, visit https://groups.google.com/groups/opt_out. >> > > > >-- >Isaac Goldman >5142334423 > >This message contains confidential information and is intended only for the >individual named. If you are not the named addressee you should not >disseminate, distribute or copy this e-mail. >-- >-- >You are currently subscribed to the "R/C Tank Combat" group. >To post a message, send email to [email protected] >To unsubscribe, send email to >mailto:rctankcombat%[email protected] >Visit the group at http://groups.google.com/group/rctankcombat > >--- >You received this message because you are subscribed to the Google Groups "R/C >Tank Combat" group. >To unsubscribe from this group and stop receiving emails from it, send an >email to mailto:rctankcombat%[email protected]. >For more options, visit https://groups.google.com/groups/opt_out. > -- -- You are currently subscribed to the "R/C Tank Combat" group. To post a message, send email to [email protected] To unsubscribe, send email to [email protected] Visit the group at http://groups.google.com/group/rctankcombat --- You received this message because you are subscribed to the Google Groups "R/C Tank Combat" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. For more options, visit https://groups.google.com/groups/opt_out. -- -- You are currently subscribed to the "R/C Tank Combat" group. To post a message, send email to [email protected] To unsubscribe, send email to [email protected] Visit the group at http://groups.google.com/group/rctankcombat --- You received this message because you are subscribed to the Google Groups "R/C Tank Combat" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. For more options, visit https://groups.google.com/groups/opt_out.
