Over-charging a lead acid battery can produce hydrogen sulfide, a colorless, poisonous … The rate of self discharge for any battery depends on the temperature at which it's stored. Unlike typical NiMH batteries, Centura low self-discharge D battery can retain up to 85% of capacity even if stored for 1 year! Low AltiDude. I see some alternation in your discharge curve. 3) The difference between the best LiPos out there and the worst ones I have (Venom brand) is not huge.

You can see this effect in #2, where the discharge voltage actually rises with time for a portion of the discharge. The hydrogen can be induced to enter and exit the metal matrix by electrochemical means. You may think that calculating how long a battery will last at a given rate of discharge is as simple as amp-hours: for given capacity C and discharge current I time will be, However, battery capacity decreases as the rate of discharge increases.

Please forgive such a newbie question. Thus the nickel-metal-hydride battery is a variation on the nickel-hydrogen battery, with a new, low-pressure, method to store the hydrogen.

Aug 03, 2017, 06:17 AM #2; PGR. Red Scholefield replies: ... Ni-Cd Battery Charging. Battery temperature above 125 degrees can lead to cell damage.

So at room temperature they will lose around 30-50% of their power within a month.

I'm using about 0.25c for charging them. 4) Charge batteries with a “peak” charger whenever possible. So there is a decrease in the battery voltage with time in addition to alternation.

Sign up now. The reason for this being that NiMH batteries discharge faster the warmer they are. to remove ads between posts.

5) Discharge the battery after every use and before storage. I read in another thread that Lithium ion cells can only handle 2C discharge and that is why higher powered lights use Nimh cells. 5%, 10%, maybe a little bit more in extreme cases. Also, NiMH are sensitive to damage on overcharge when the charge rate is over C/10 (C is the capacity of the battery, so a charge rate of C/10 would give a full charge in 10 hours).

But not if you store them in the freezer. You probably mean to ask: What is the self discharge rate of a NiMH battery?

2) Batteries, NIMH and LiPo, can perform better when warm (~120F) than cold.
Table 4: Nominal and recommended end-of-discharge voltages under normal and heavy load.The lower end-of-discharge voltage on a high load compensates for the greater losses.

Stored at 70 degrees F (20 C) NiMH batteries will lose up to 40% of their charge within a month. A flat discharge curve simplifies the design of the application in which the battery is used since the supply voltage stays reasonably constant throughout the discharge cycle. A fully charged battery loss it capacity when not in use for long time. The self discharge rate of NiMH battery is 5-10% on the first day. This will cause corrosion, you want your batteries to remain dry) The Next Step. LOW SELF DISCHARGE - These D size battery experience significantly low power loss when properly stored and unused. PGR. Use a voltmeter to monitor battery voltage during charging with simple charger. (Make sure there is no moisture in the bag.

NiMH batteries do have a couple of flaws, mainly that they self-discharge. When peak is reached and voltage begins to drop the battery is fully charged. I was all ready to settle on NiMH, until I found Low Discharge NiMH…and then the new LiFePo4 batteries.

Can someone give me the "C" rule for rate of discharge and amp handling capability of Nimh cells?

Battery capacity is a measure (typically in Amp-hr) of the charge stored by the battery. To make matters worse, new NiMH batteries can exhibit bumps in the curve early in the cycle, particularly when cold. EXTENDED CYCLE LIFE - Rechargeable up to 2,100 times without significant capacity lost.

When the battery is not in use it will slowly deplete its charge and if it's left long enough your batteries can be permanently damaged. Discharge Curve of Single-CellBattery Under Different Load Conditions A commonly misunderstood concept of battery voltage is that the specified discharge voltage curve in the data sheet indicates the voltage under a specified load condition. ... I’ve repeatedly heard over the years that it could damage a cell to discharge it to less than 1V per cell and are you recommending this as a routine test for modelers to find weak cells? I assume cells such as the 1700 elites have a discharge of greater than 2C and that are better than 3300mah C li-on cells … Fortunately, with the development of new Nickel-Metal Hydride (NiMH) battery options, improvements in electronics have now been matched by significant improvements in the batteries that power them.



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