Replacing the Lead acid shell inside K2 with Li-Po cells
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Replacing the Lead acid shell inside K2 with Li-Po cells
 
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Hello Group,
3.7v 3300mAH Li-Po cells are cheaply available locally. Multifunction balance intelligent chargers are cheap as well. I am seriously thinking of replacing the lead acid cell inside the KBT2 with 3 x 3.7v Li-Po cells. However, charging of the Li-Po cells requires multifunction charger. The existing battery circuity inside K2 seems not fit for this purpose. A direct connection to the battery terminals is required. I would be grateful if any of you could advise me the 'do' and 'don't' that I should pay attention to. With the Li-Po cells installed, the weight of K2 QRP will be much reduced with more battery capacity. K2 is even more suitable for ARES purposes. Looking forward to your advice. TNX & 73 Johnny VR2XMC Yahoo!香港提供網上安全攻略，教你如何防範黑客! 請前往 http://hk.promo.yahoo.com/security/ 了解更多! ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[hidden email] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html |
Re: Replacing the Lead acid shell inside K2 with Li-Po cells
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Johnny,
Take a look at my website article to see how I connected a SmartCharger to the K2 internal battery. See www.w3fpr.com. True, the battery and charger are different, but the concept is the same. The battery connection should be fused for safety. 73, Don W3FPR Johnny Siu wrote: > Hello Group, > > 3.7v 3300mAH Li-Po cells are cheaply available locally. Multifunction balance intelligent chargers are cheap as well. I am seriously thinking of replacing the lead acid cell inside the KBT2 with 3 x 3.7v Li-Po cells. > > However, charging of the Li-Po cells requires multifunction charger. The existing battery circuity inside K2 seems not fit for this purpose. A direct connection to the battery terminals is required. > > I would be grateful if any of you could advise me the 'do' and 'don't' that I should pay attention to. > > With the Li-Po cells installed, the weight of K2 QRP will be much reduced with more battery capacity. K2 is even more suitable for ARES purposes. > > Looking forward to your advice. > > TNX & 73 > > Johnny VR2XMC > > Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[hidden email] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html |
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In reply to this post by Johnny Siu
I thought about this and even bought a 3 cell battery and balanced charger - then I realised the dangers of LiPo and decided against it in favour of 10 2.5AH NiMH cells in a 5 over 5 holder. This fits in fine in place of the lead acid, is a lot lighter and can be charged quite easily with minor modifications to the K2 battery system.
I am interested in the results though as I still have the LiPo and balanced charger. Mike
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I think that dangers of protected Li-Ion batteries are way overblown. After all, millions of laptops with those batteries fly every day with no problem.
The charging problems are overblown as well. What happens if the battery life is 100 charges and not 500 when you need to charge every two weeks. By the time the battery is weak it is obsolete. I have 2 x 3 pack of computer Li-ion cells (with built-in protection) in my K2 for 5 years. Charged via a 12.6V 1A regulator with a laptop PS. Light and zero problems. It seems that charging each cell 4.2V (or 12.6V for 3 cells) with some current restriction is a good enough technique for longevity. Ignacy
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Replacing the Lead acid shell inside K2 with Li-Po cells
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In reply to this post by Johnny Siu
Hello Group,
I must say 'big thanks' to every one of you in answering my questions in this mail reflector or privately off the list. All of your answers are highly informative and give me the drive to learn more. The beauty of this reflector is that I can be educated from quite a number of learnt personnel. I sometimes disagree with some of you in the matters of K2 or K3. I even think that I have been offensive to some of you. No, I am totally wrong. Many of you are just so helpful that you offer your helping hands right the way. Thanks, Johnny Siu VR2XMC Yahoo!香港提供網上安全攻略，教你如何防範黑客! 請前往 http://hk.promo.yahoo.com/security/ 了解更多! ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[hidden email] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html |
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