My KV-2 (carbon steel tracks) is considerably heavier than the Cromwell and therefore will draw more amps under load which is why I want lithiums. They deliver more consistent current at higher amps. On 7AH bats, the KV will do exactly one neutral turn in the grass before running too low to do another. On concrete, it can do donuts and drift (short ones). I also like the Li bats for their storage potential. My tanks don't get run that often so I like that I can leave the Li bats alone much longer without doing damage to them.
Derek On Thu, Dec 13, 2012 at 11:58 AM, TyngTech <steve...@gmail.com> wrote: > I've always wondered the same thing but I will say that my Werker 20AH > batteries do seem heaver than the standard 17AH. > > I've always just assumed that whats printed on the case is so much > marketing hype and that actual capacity is always less than advertised. > > Steve > > > On Thursday, December 13, 2012 12:53:46 PM UTC-5, RocketMan wrote: > >> One more thing to consider, too. Do we have any reason to believe that >> the other 17Ah batteries are truly 17Ah ? Has anyone besides Electonic >> Goldmine (the $10 seller) tested them ? >> >> >> >> I'm very tempted to believe that two SLA batteries the same size have >> roughly the same capacity. Unless one is hollow or filled with rocks, it >> doesn't seem like there could be much difference. They're probably made in >> the same factories and simply labelled for the individual brands. >> >> >> >> - Doug >> >> ------------------------------ >> >> *From: *"TyngTech" <stev...@gmail.com> >> >> *To: *rctank...@googlegroups.com >> *Sent: *Thursday, December 13, 2012 11:02:25 AM >> *Subject: *Re: [TANKS] Re: 12V17Ah batteries for $10 ! >> >> I think everybody is missing a point here. SLA's are SLA's. There all >> crap compared to the newer technology but they do work and at a reasonable >> price. Chargers are common, cheap, and easy to use. The batteries in >> question are a common forma factor (I use two of this type in the >> Cromwell). These cheap batteries might be a good option for someone to use >> for building and testing. After they have the tank built, you can then >> upgrade to the $80 (each) Werker 12V 20AH deep cycle's that run the >> Cromwell for a good hour. >> >> >> ST >> >> >> On Thursday, December 13, 2012 9:52:53 AM UTC-5, tan...@gmail.com wrote: >>> >>> Which is another reason to stay away from them. Those 7AH batteries I >>> used for testing only powered the KV for about 3 min before noticeably >>> draining. I need batteries that can deliver more amps for longer. Hence >>> wanting to go with the LiFEPO4 bats. >>> >>> Derek >>> >>> On Thu, Dec 13, 2012 at 8:20 AM, <pil...@comcast.net> wrote: >>> >>>> its not half the power though, the way lead acid batteries and for >>>> that matter most all batteries work is their voltage drops with power draw. >>>> a 17Ah battery thats rating out at 10Ah is for all intents junk, its >>>> voltage drop will be far greater than that of a healthy 17Ah battery, >>>> greater than simply the straight amp difference the the batteries rating >>>> out at 10Ah will also not be able to supply the same current draw before >>>> overloading. Id be leery of buying these batteries >>>> >>>> ------------------------------ >>>> *From: *"Joe Sommer" <anvi...@comcast.net> >>>> *To: *rctank...@googlegroups.com >>>> *Sent: *Thursday, December 13, 2012 7:13:14 AM >>>> *Subject: *[TANKS] Re: 12V17Ah batteries for $10 ! >>>> >>>> >>>> >>>> >>>> On Wednesday, December 12, 2012 8:04:20 PM UTC-5, RocketMan wrote: >>>>> >>>>> The seller says the tested spec is closer to 10Ah. Still, they >>>>> aren’t going to get any less expensive than this: >>>>> http://www.goldmine-elec-**products.com/prodinfo.asp?**number=G19025<http://www.goldmine-elec-products.com/prodinfo.asp?number=G19025> >>>>> >>>> Doug, >>>> >>>> I put two in my shopping cart and checked shipping. >>>> $20.00 for two batteries >>>> $24.20 for shipping >>>> Total = $44.20 for two >>>> >>>> eBay item 170883786550 >>>> RBC7 two 12V 18Ah SLA batteries >>>> free shipping >>>> Total = $72.48 for two >>>> >>>> About half-power for about half-price >>>> >>>> Joe >>>> >>>> -- >>>> You are currently subscribed to the "R/C Tank Combat" group. >>>> To post a message, send email to rctank...@googlegroups.com >>>> To unsubscribe, send email to rctankcombat...@googlegroups.**com >>>> Visit the group at >>>> http://groups.google.com/**group/rctankcombat<http://groups.google.com/group/rctankcombat> >>>> >>>> -- >>>> You are currently subscribed to the "R/C Tank Combat" group. >>>> To post a message, send email to rctank...@googlegroups.com >>>> To unsubscribe, send email to rctankcombat...@googlegroups.**com >>>> Visit the group at >>>> http://groups.google.com/**group/rctankcombat<http://groups.google.com/group/rctankcombat> >>>> >>> >>> -- >> You are currently subscribed to the "R/C Tank Combat" group. >> To post a message, send email to rctank...@googlegroups.com >> To unsubscribe, send email to rctankcombat...@**googlegroups.com >> Visit the group at >> http://groups.google.com/**group/rctankcombat<http://groups.google.com/group/rctankcombat> >> > -- > You are currently subscribed to the "R/C Tank Combat" group. > To post a message, send email to rctankcombat@googlegroups.com > To unsubscribe, send email to rctankcombat+unsubscr...@googlegroups.com > Visit the group at http://groups.google.com/group/rctankcombat > -- You are currently subscribed to the "R/C Tank Combat" group. To post a message, send email to rctankcombat@googlegroups.com To unsubscribe, send email to rctankcombat+unsubscr...@googlegroups.com Visit the group at http://groups.google.com/group/rctankcombat
