I heard really good things about this pack and with them being the cheapest hardcase packs ($15.50) on hobby kings site I just had to give them a try and see what they were made of . WellI started by checking the voltages when I got these in . One pack was at a little down with cell 1 at 3.84 and cell 2 at 3.85 . The second pack which by the warranty number was a bit newer was at 3.86 on both cells so in my opinion things looked pretty good from the start . I then solder on a couple of dean's style T-connectors and proceeded to charge the packs up . After handling the wiring harness a bit I decided I didn't want to use the stock harness for running in my car or for fast charging and made 2 more harnesses minus the balance plug as it could be damaged . After the packs got done Balance charging I decided to take them for a spin and yes virginia these packs do have some punch dare I say more than the Turnigy 30C 4000mah packs I tried hmm further testing is needed because despite feeling Zippy these packs did warm up a hair bit but that may be due to this being there first outing . After I get a few more cycles on these and the Turnigys I will be updating these post .
This pack has a Relative Amp 25C x 4A = 100rA $15.50 / 100rA = 0.155cE the lower the number the Cost Effective
Manufacturer description: ZippyFLIGHTMAXbatteries deliver full capacity & discharge as well as being the best value batteries in the hobby market today!
Spec. Capacity: 4000mAh Voltage: 2S1P / 2 Cell / 7.4v Discharge: 25C Constant / 30C Burst Weight: 235g (including wire, plug & shrink wrap) Dimensions: 138x47x23mm Balance Plug: JST-XH Discharge plug:4mm Bullet-connector to your own custom plug UPDATE Latest stock has improved soldering and tab joins. Removing previous issues related to 'cold solder' breakages.
Well I bought a 5000Mah 20c 2s 7.4 v lipo battery pack from a company in Brooklyn New York .
06/10/13 - 09/01/14 RIP
Minimum Capacity:
5000mAh
Configuration:
2S1P / 7.4v / 2Cell
Constant Discharge:
20C
Peak Discharge (10sec):
30C
Pack Weight:
308g
Pack Size:
145mm x 52mm x 30mm
Balance Plug:
JST-XH
Discharge Plug:
NO
Quantity:
1
I had good experiences with their smaller batteries as can be found in other parts of this blog but I find myself not being able to recommend this pack and many of their other higher capacity packs .
This particular pack was the best deal as far as I could see but after getting it I realized it wouldn't fit anything I owned its several mm wider than a shotgun style NIMH pack and longer than a 6-cell pack but slightly shorter than a 7-cell pack . This made fitment virtually impossible in almost all my models but my ZD Racing 1/10th scale truck and really it was such a tight fit that It makes me uncomfortable .
The other problem I had was that the power output in my opinion is low even for a 20c rating I found I could only get reasonable performance for around half the pack after the voltage dropped below 4.0 volts it could not provide the amperage needed for my mild brushless system that I was testing it with . The measured usable capacity was normally around 3000 Mah .
This pack has a Relative Amp 20C x 5A = 100rA
$12.99 / 100rA = 0.1299cE the lower the number the Cost Effective
Now looking at this graph it should give you a idea of why my battery didn't meet what most people would expect from the ratings . To clarify if you don't see what this is showing is that the mah rating was determined at a 1C discharge or a 2.2 amp draw but when a 25C load was introduced the usable capacity dropped off from 2250 ish to 2050 ish .
Its also Important to note that when a manufacturer uses this method that the gap between the listed capacity and usable capacity gets bigger as the capacity get bigger . This is one of many reasons why most sellers and battery makers don't use the 1C discharge method to determine battery capacity.
The reason I find it hard to recommend (or even buy ) there other higher capacity and C rated batteries is that for the cost you could be buying a battery that is well known in the hobby community for good performance and value with a more appropriate battery rating .
Well I picked up a pair of these out of the USA warehouse . All I an say is wow the value of these packs are great they have nice thick wires and can definitely dump the amps with very little voltage sag . Probably the most notable thing is that these packs live up to there rated capacity But I don't plan to buy anymore of these after trying the Zippy 4000mah because the case an finish is much better in my opinion .
This pack has a Relative Amp 30C x 4A = 120rA
$19.99 / 120rA = 0.166cE the lower the number the more Cost Effective
Well I bought a couple of these on clearance a while back . These where rated at 1300 mah apparently these where being discontinued and being replaced by 2000 mah versions . In my testing these have shown a capacity of 900 mah and for there cost ($5.00 for a 2 pack) I really must recommend purchasing another battery as these probable have a worse capacity to cost ratio of any battery I have tried . The only place I have really seen these around are at dollar stores and are probably primarily bought by people in need of emergency batteries . If you are reading this do your self a favor and buy a few spare packs of precharged batteries to avoid these as much as possible.
Manufacture description of there new batteries Eveready® Rechargeable AA Features and Benefits
Designed to give you 100's & 100's of charges No memory effect Economical power for high drain devices 2000mAh NiMH Works great in toys and digital cameras Works in all NiMH battery chargers Take up to 250 digital photos per charge*
Well I got some of these for christmas this year and I can say I wont be purchasing these for my self anytime soon . The cells that I received where rated at 2450 Mah and in my testing they fell short of there rated capacity in my testing and only showed a capacity of around 2300 Mah . For the average cost of these batteries you can buy 2-3 packs of some of the house brands I have tried . For now I'm going to stick with buying the North Tech batteries from Menards .
Sorry to make this short short but really this is about all I can say about these .
Well I bought a 4 pack of these batteries from Menards for $5.98 and so far I'm pleased with them. I had been using them for a bit and did the same test that I preformed on the Rayovac's . I used myGT Power X-Charger C6 to discharge the batteries at 1 amp down to 1 volt each and then recharged them at .5 amp and then a second discharge . The charger reported a capacity of 2262 Mah . I also used / Tested them in my RC transmitters and used them to power a few Toy grade cars and can definitely tell you that in the toy grade cars there is a noticeable improvement in power and run time Vs the Rayovac's . I love the fact that these are precharged and ready to go like the Rayovac's I was using and have around 50% more capacity for less money . Not to say that I don't like the harbor freight batteries I tried but the fact that these just give up a little capacity for the convenience of them being precharged is what has sold me on these batteries . http://www.menards.com/north-tech-precharged-nimh-batteries-aa/
Manufacture description North Tech Precharged NiMH Batteries - AA Model Number: AC742 | Menards® SKU: 5755841Product Description Ready to use right out of the package. Holds charge longer than regular NiMH. Designed to be used with high drain devices. Dimensions: 4 Pack Ship Dim: 4.38 x 3.62 x 0.5 Shipping Weight: 1.9 lbsVendor: North Tech
Well I picked up a 4 pack of these at Harbor Freight awhile back .The positive reviews on there site for these batteries are the main reason I purchased these .I basically did the same test as I did with the Rayovac batteries by using my GT Power X-Charger C6 to discharge the batteries at 1 amp down to 1 volt each and then recharged them at .5 amp and then a second discharge . The capacity that the charger reported was for these brand new batteries was 2325mah . Since they seem to be underrated a bit (rated at 2200 Mah) I am quite happy with my purchase at this time . After these get some more age on them I will test again them to see how there doing .
Charge these NiMH batteries up to 1000 times for long performance life in your MP3 player, CD players, digital camera or any other high-output portable electronic device! NiMH (nickel metal hybrid) has replaced NiCd (nickel-cadmium) as the battery of choice due to its higher capacity. Another nice advantage is that you don’t need to drain these rechargeable batteries first to get a full charge (no memory effect).
NiMH batteries feature no memory effect, higher capacity than nickel cadmium (NiCd) batteries. Charge up to 1000 times (charge time approx. 1.66 hours) Longer lasting for digital electronics Battery charger sold separately
Battery charger sold separately. This item can only be shipped within the 48 contiguous states via Standard Ground Shipping.
Specifications
Name 4 Piece AA High Capacity NiMH Rechargeable Batteries SKU 97866 Brand Chicago Electric Power Systems Battery capacity 2200 Battery voltage (volts) 1.2 Rechargeable (y/n) Yes Rechargeable up to (# of times) 1000 Battery size AA
I have been using these batteries for a while .I can defiantly say that these have saved me lots of money over disposable batteries especially since these can be bought In a 8 pack for $13.97 at Walmart and come precharged. I try to always keep one fresh pack unopened and ready to go in case I forget to charge a set.
Recently I decided I would try a few other brands to see if there where any better deals out there but first I wanted to see what kind of capacity these batteries had to get a base line I used myGT Power X-Charger C6 to discharge the batties at 1 amp down to 1 volt each and then recharged them at .5 amp and then a second discharge . The capacity that the charger reported with each group of batteries ranged from 650mah to 1450mah depending on there age . The oldest group of 8 are about 2 years old and probably have over a hundred cycles through them with the newest having 2 cycles through them . So far I have not had any complete failures but more than likely age will start to catch up with my oldest cells in the future. Manufacture description
Rayovac's Everyday-Use line offers your best value in rechargeable power for high-drain devices.
Model:LD715-4OPA
Features and Benefits:
Affordable, reusable power solutions for the entire family
Pre-charged and ready to use out of pack
Low self discharge technology allows batteries to stay charged longer so they are ready when you need to use them
Holds charge 3X longer than standard NiMH rechargeables when not in use
Recharge up to 500 times
Reduce waste and save money. Keep disposable batteries out of the landfills and save hundreds of dollars when you use rechargeable batteries versus alkaline.
AA rechargeables take up to 300 photos* per charge when fully charged. This is 8x more digital photos than Energizer Ultimate Lithium when recharged just 25 times.
Batteries can be used in any AA device and work in all NiMH chargers. For best results use with a Rayovac charger.
NiMH rechargeable batteries do not have a “memory effect,” meaning that it is OK if you repeatedly recharge them after only being partially discharged. NiCad batteries have a “memory effect” and lose their maximum energy capacity if recharged before being fully discharged.
Well I bought this 1/16th scale brushless car from ZD Racing and I needed some lipo's that would fit .
Being the cheap'o I am I searched the net high and low and came across some batteries on Ebay that fit the bill . They were being sold out of Brooklyn, New York and they where holding lot's of auction's on batteries . The name on the batteries was YKS and I couldn't find any opinions or anything about these batteries .I eventually decided they where cheap enough to for me to take a risk on buying them . So far I have bought 6 of these batteries and out of the 6 I have had to contact the seller and get a replacement on 2 of these batteries . Now for the price of these batteries I am not complaining one bit I bought these dirt cheap and if the inconvenience of getting a dud is unexceptionable don't buy these as with anything cheap there is a risk . But in my opinion the seller I bought these from was top notch . They sent me replacements with no hassle and I got them in around 3-5 business day's just like my initial order.