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Battery charging - completion not auto but based on fixed time period?

g8tzl2004 All Messages By This Member #112659 Does the FT-817 battery pack normally get hot when charging? I think I read that the charge current is 200mAH? Is this correct? It appears that you need to select different time periods ie 6 hours, 8 hours etc. The official time period for a 1400mAh NiMH pack is 8 hours ie 8 * 200 = 1600 but "energy conversion" is not 100% perfect. What happens if you don't know how fully charged the battery pack is? A full 8 hours might cook the batteries? As the battery pack ages, the capacity will probably decline. So again a fixed 8 hr charge might cook the batteries?
Leon All Messages By This Member #112660 You could leave the radio on until the battery is discharged, then charge it for the full 8 hours. It won't discharge completely, of course, which is bad for Ni-Cd batteries. 73, Leon G1HSM
g8tzl2004 All Messages By This Member #112661 I wonder if the new FT-818 does "delta v" charging so the battery charge is terminated when the batteries are actually full?
Pietro Molina All Messages By This Member #112663 No. Same charging method reading the manual. Pietro I2OIM toggle quoted message Show quoted text Il giorno sab 30 apr 2022 alle ore 15:33 g8tzl2004 via <g8tzl2004=[email protected]> ha scritto: I wonder if the new FT-818 does "delta v" charging so the battery charge is terminated when the batteries are actually full?
g8tzl2004 All Messages By This Member #112665 I guess Yaesu must make a significant profit on selling new battery packs to replace all the killed packs...otherwise I can see no other reason for not having an "intelligent" battery charging system!!
Leon All Messages By This Member #112666 I must have had my 817 for about eight years and am still on the original battery. I don't use it very much. 73, Leon G1HSM toggle quoted message Show quoted text On 30 Apr 2022 15:14, "g8tzl2004 via groups.io" <g8tzl2004@...> wrote: I guess Yaesu must make a significant profit on selling new battery packs to replace all the killed packs...otherwise I can see no other reason for not having an "intelligent" battery charging system!!
Ken N2VIP All Messages By This Member #112667 开云体育 I do not believe the FT-817/818 "kills" it's battery packs, I've never heard complaints about that and I never saw FT-817/818 owners stream into radio retailers to buy replacement packs for their radios. Ken, N2VIP toggle quoted message Show quoted text On Apr 30, 2022, at 09:15, g8tzl2004 via groups.io <g8tzl2004@...> wrote: ?I guess Yaesu must make a significant profit on selling new battery packs to replace all the killed packs...otherwise I can see no other reason for not having an "intelligent" battery charging system!!
Scott McDonald #112668 开云体育 Same boat here, my original pack lasted 4 years and about 200 charge cycles. ?I thought it a bargain, and 3 sets of Eneloops handled the last 15 years. 6/ Scott ka9p Make something good happen! toggle quoted message Show quoted text On Apr 30, 2022, at 9:27 AM, Leon via groups.io <leon355@...> wrote: ? I must have had my 817 for about eight years and am still on the original battery. I don't use it very much. 73, Leon G1HSM On 30 Apr 2022 15:14, "g8tzl2004 via groups.io" <g8tzl2004@...> wrote: I guess Yaesu must make a significant profit on selling new battery packs to replace all the killed packs...otherwise I can see no other reason for not having an "intelligent" battery charging system!!
Marty Hartwell All Messages By This Member #112669 开云体育 Hi I think the thing that kills the batteries is the fact that people turn them off and leave them set to allow the battery discharge to past the charge that will make it short. Then the self oscillation in the rig kills the battery and maybe the finals also. My FT-817 was made in 2001 and still has the same finals. I have always removed the batteries when it was to set on the table for a while. Now I leave it plugged into a power supply and use it that way as portable operations are not available to me at this time. Marty kd8bj On 4/30/22 10:30, Ken N2VIP wrote: toggle quoted message Show quoted text I do not believe the FT-817/818 "kills" it's battery packs, I've never heard complaints about that and I never saw FT-817/818 owners stream into radio retailers to buy replacement packs for their radios. Ken, N2VIP On Apr 30, 2022, at 09:15, g8tzl2004 via groups.io <g8tzl2004@...> wrote: ?I guess Yaesu must make a significant profit on selling new battery packs to replace all the killed packs...otherwise I can see no other reason for not having an "intelligent" battery charging system!!
martinbradford2001 #112670 On Sat, Apr 30, 2022 at 03:14 PM, g8tzl2004 wrote: I guess Yaesu must make a significant profit on selling new battery packs to replace all the killed packs...otherwise I can see no other reason for not having an "intelligent" battery charging system!! I don't think many FT-81x owners buy Yaesu replacement battery packs. When I was active in the 817 owners community, the norm was to either put high capacity NiMH AA cells into the dry battery tray, or to purchase external battery packs if you wanted longer running times. Also don't forget that the design of the 81x has changed very little since the original release - and that came with NICADs - no need for intelligent charging there... Martin (G8FXC)
Al WB9UVJ Member Profile All Messages By This Member #112671 The original FNB-72 battery pack is NiCd.? That charges perfectly fine with a constant current charge.? The timer allows you to select a shorter time depending on what you determine to be the state of charge on your pack.? With constant current charging, once the battery is at full charge, the extra current generates heat.? So yes it is possible for the battery to get warm during charge.? I would not recommend that you charge a battery that is already warm, charge while the radio is in the sun or with the radio enclosed (in a box or a go-to carrier). -- Al Skierkiewicz WB9UVJ
simon All Messages By This Member #112672 NiMH and NiCd can both generally take C/10 overcharge indefinitely (well for many hours). So timed charge is fine, even if they are half charged when you start. (my '817 is 260mA) Originally NiMH calls had substantial leakage current, and self discharged in perhaps 6 months without use. Nowadays, you should be sure to only buy LSD (low self discharge) also sold as "precharged" NiMH. e.g black eneloop pros. They also have limited life,?Energiser say: "However, battery life is limited to 5 years or less." and "Typical expectancy?life?is 2 to 5 years." They will heat up during the overcharge phase, which makes dTemp an excellent end of charge indicator. -dV is commonly used to automatically end charge, but it also works because the battery is heating up i.e. dV/dTemp is -ve
g8tzl2004 All Messages By This Member #112676 But the official 1400mAH NiMH pack is being charged at around C/5 so its not being "trickle" charged. Any views on using a fused AA battery box when using 2600mAH LSD Eneloops. Can thin round fuses be purchased that will slot between AA batteries ie same diameter as an AA battery? I guess one could be made with some stiff thin plastic and thin copper tape? Any views on charging Eneloops inside vs outside the 817?
Greg D All Messages By This Member #112701 开云体育 {sigh}? Yes, it's just by time.? You get to be the "smart charging" algorithm in judging how long to charge, based primarily on gut feel.? There is little indication of what the battery's state of charge is, other than when it's totally flat.? The only saving grace is that overcharging doesn't damage the battery.? NiMH batteries can be left on a low charge (c/20 or so) essentially forever.? This is different from the Lithium-based batteries which must be actively managed by a BMS to prevent both over and under charging, either of which can lead to "a bad day". Greg? KO6TH g8tzl2004 via groups.io wrote: toggle quoted message Show quoted text Does the FT-817 battery pack normally get hot when charging? I think I read that the charge current is 200mAH? Is this correct? It appears that you need to select different time periods ie 6 hours, 8 hours etc. The official time period for a 1400mAh NiMH pack is 8 hours ie 8 * 200 = 1600 but "energy conversion" is not 100% perfect. What happens if you don't know how fully charged the battery pack is? A full 8 hours might cook the batteries? As the battery pack ages, the capacity will probably decline. So again a fixed 8 hr charge might cook the batteries?

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