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 ----- Original Message ----- From: "TyngTech" <[email protected]> To: [email protected] 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, [email protected] 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, < [email protected] > wrote: <blockquote> 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" < [email protected] > To: [email protected] 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: <blockquote> 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 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 [email protected] To unsubscribe, send email to [email protected] 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 [email protected] To unsubscribe, send email to [email protected] Visit the group at http://groups.google.com/group/rctankcombat </blockquote> </blockquote> -- 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 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
