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| Is it just me or have rechargeable NiMH improved? |
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| IanB:
--- Quote from: alm on November 14, 2022, 05:09:29 pm ---Can you find data showing the self-discharge rate of <=2000 mAh NiMH batteries before the introduction of Eneloop having a similarly low self-discharge rate as the 2000 mAh (typ) Eneloop batteries? --- End quote --- I bought a few old generation NiMH cells of 2000 mAh capacity, of varying brands. They all had terrible self-discharge and would be down to zero after a month or so of storage. When tested side by side with the newly introduced Eneloops, the Eneloops not only held their charge for years, but also had a higher discharge voltage and could sustain higher load currents. Eneloops were vastly better in all respects. |
| edy:
Thanks for all the great info everyone!!! I never thought this much development was going on with regular consumer rechargeable batteries. So I was not imagining things… I didn’t have a leprechaun playing around with my Duracells at night. :-DD Remember I hadn’t bought any rechargeables for years, everything these days seems to come with their own built-in batteries or special packs that are proprietary configurations, or some Li-Ion pack. Little did I know how much better new NiMH are compared to my old ones to power my everyday AA/AAA battery devices! Back to the charger question, does anyone have any experience with “EBL” brand stuff? I saw this on Amazon as I want to get something that won’t kill my new Duracells and the specs sound really good for under $30 Canadian (charger and 4x AA and 4x AAA): - 4 Slot Independent charger: can charge 1/2/3/4 AA/AAA Ni-MH Ni-CD rechargeable batteries. It can charge the number of AA AAA batteries randomly you needed, you don’t need to charge batteries in pair anymore. - Smart LCD display: With LCD screen to show the charging process, battery status can be easily monitored. - High capacity rechargeable batteries - 2800mAh AA battery & 1100mAh AAA battery, has long lasting and superior performance. EBL 1.2V Ni-MH AA AAA rechargeable battery can be recharged up to 1200 times. - Low self-discharge - Batteries will remain 90% juice when you leaving it for no use 1 year. - Package: 1 x FY-409 Battery Charger, 1 x 4 pack AAA 1100mAh rechargeable batteries, 1 x 4 pack AA 2800mAh rechargeable batteries, 1 x User Manual, 1 x Micro USB Cable. https://www.amazon.ca/EBL-Slot-Battery-Charger-Screen/dp/B08BQYGWHJ First, I don’t believe the mAh rating on any of those batteries. I don’t really need any more batteries, I just want a decent charger. It says will retain 90% “juice” :-DD after 1 year so I assume they are LSD type and the charger that comes with it will not kill them or my Duracells. The Panasonic smart charger alone is about $20 so for only a bit more I can get a bunch more batteries, assuming this EBL brand charger is any good. The only drawback is it uses USB inputs so I’ll need a wall-wart adapter from some other device to plug into the wall. My other chargers would just plug into 120V mains. |
| bdunham7:
--- Quote from: edy on November 14, 2022, 10:11:36 pm ---Back to the charger question, does anyone have any experience with “EBL” brand stuff? --- End quote --- Not with that model, but I have an EBL 906 (large per-cell smart charger with basic screen) that isn't very good--it seems to occasionally overcharge/overheat cells and so on. I used it before I got the other two I mentioned and I wasn't as happy with NiMH batteries then. To be sure, some of the batteries themselves weren't good, but since I got the 338XL even most of my Tenergy cells have been behaving. And for those that don't, the 338XL calls them out if you know how to use it. OTOH, I have the EBL 9V Li-ion replacements and their specific EBL charger and they have all been great. |
| james_s:
--- Quote from: jmelson on November 14, 2022, 04:26:51 pm ---Take the new cells and old, and compare weight. My kids bought me some hardware store Energizer NiMh D cells, and I could tell immediately by their weight that they must have had about an AA cell worth of real cell inside. When new, they would run my flashlight for about 30 minutes. Now, that's down to 10 minutes, and I just got some new ones off eBay that weight tells me they at least have (something) inside. I will have to use them to see how much longer they last. Jon --- End quote --- AA are by far the most common, and most C and D NiMH cells are actually just AA or occasionally sub-C. True C and D NiMH are much more expensive and harder to find. |
| edy:
If you look carefully at the photos the Duracell batteries say charge at 250mA for 16 hours. My energizer charger is 300mA output so it would be slowly charging these batteries… maybe 13-14 hours because of the slightly higher mA. I don’t know what the Energizer charger does to figure out when to shut off or if it actually just continues charging while the green light simply shows some parameter it’s reading off the pair of batteries. As well, will eneloop charger from Panasonic work on these Duracells or will it have problems? It’s quite strange that Duracell doesn’t really make too many chargers… it has a value charger and a premium charger. The value charger says 8 hours and the value charger comes with 1300 mAh AA’s which get charged in pairs, which makes me think it’s just a dumb charger probably output 250-300mA which would make a 2500mAh battery need about twice as long to fully charge (hence why my battery says 250mA for 16h)? Or because they are paired they are in series and act as if they are a 2x1300mAh battery, meaning that an individual-cell charger would also do 8h charge if individual slots also received 300mA? Their premium charger (Ion Speed 4000) is 1-2.5h and it also comes with 1300mAh AA batteries and 750mAh AAA’s. I don’t have any specs on it but it claims 4000 mW of charging power. Assuming a pair of batteries takes 2.8V input and 4000 mW is for both pairs, one pair would be 2000 mW which would mean probably around 700-750mA charging current. Am I doing the math ok? The Panasonic 6h charger for 750mA eneloop AAA’s outputs 1.5V at 150mA and will go to 300mA for AA’s (which it claims 7h to charge 2000 mAh AA batteries). So the Panasonic is using same current (300mA) and same charge time (7-8h) to charge a 2000 mAh eneloop while Duracells is charging a 1300 mAh battery in pairs for about same time, because the Duracell is charging in pairs? |
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