Storage recommendation for various battery types

[yiela]

hmmmm ...nice offer ... i pm when i need it..

[jameskhoo]

It depend,if you plan for racing,then go for nimh,if just bushing around you can buy li-po.
i got good price on li-po combo [1 3600mah 7.4v li-po with li-po charger(1-3 cell charging)for only rm450]

[yiela]

thanks... new info....what is better? LiPO or NiMH?

[jameskhoo]

Li-po more punch??the Li-po peak voltage is only 8.4v,Nimh peak voltage is around 9.2v.
The only advantage on Li-po is,the battery will hold it voltage high at discharging curve before it cut-off,and you can charge it 1 week before you use it,the voltage still at 8.4v,not like nimh, will go down to lower voltage when discharge,every 5 minutes 0.5v is lost and Li-po is still not legal at races in Malaysia.

[yiela]

  sorry finger error...NiMH

[Kraisorn]

U can find any where..... Nickel Cad...NiCd... for Nickel metal hydraide...NiMD... its easy to find...but actually they rechargeable battery not a common battery...for the latest kind of batt...is Li PO...or lithium polymer.... very light..compare to Sub C...have a large capacity for run time and more punch but it costly more expensive rather than NiMD and Nicd...correct me if i wrong guys...

Bukan NIMD.......its NIMH

[yiela]

U can find any where..... Nickel Cad...NiCd... for Nickel metal hydraide...NiMD... its easy to find...but actually they rechargeable battery not a common battery...for the latest kind of batt...is Li PO...or lithium polymer.... very light..compare to Sub C...have a large capacity for run time and more punch but it costly more expensive rather than NiMD and Nicd...correct me if i wrong guys...

can i ask? where did i can find this type of batteries(nickel metal hydraide) at malaysia? can you give me the characteristics this type batteries?

[br4v13]

 

thanx.... very... very...very good info.....

cheer,

[kerry]

According to NASA's Battery Handling Book, if you want to store NiCd cell(s) or battery(ies), you should discharge the to 0V then store at 0^o Celsius.

Still this guide apply to NiCd, not sure about NiMH since NASA mostly use NiCd due to their lower self-discharge rate compared to NiMH and that guideline is written in the 70's.

[Daeng]

This is good inputs for racers,specially to whom dont dont know or dont care about battery treatment actually! goood goood gooood!

[lee82gx]

let me add a bit:
GP recommendations:

6.5.2 Storage
Bear in mind that self-discharge has to be taken
into consideration when storing a charged battery.
The remaining battery capacity should be at least
50% after a month of storage at room temperature
for a fully charged battery. High storage
temperatures will accelerate the self-discharge,
and reduce the remaining capacity.
In order to maintain battery performance when
being stored for an extended period of time, cycling
(charging and discharging) of the battery within a
6 to 9 month period is recommended. This
procedure is recommended to maximize
performance of the battery and prevent low OCV
in long-term storage conditions. Failure to do so
may result in a shorter battery life.

[amirul_km]

Very good info...

Good job, kerry..

[kerry]

[NiMH (Nickel Metal Hydride)]

It makes a lot of sense to read what the battery manufacturers say about long term battery storage. The following is a selection of several manufacturers who have put information in their catalogs. Please read the disclaimer below:

NiMH (Nickel Metal Hydride)

Varta: Storage in any state of charge is possible. Storage temperatures between -20 and +35 are recommended, relative humidity approximately 50%. In case of long term storage cells must be recharged once a year.

Sanyo: Under the recommended storage conditions (-20 C to +35 C) the Twicel can be stored indefinitely in either a charged or uncharged state. Recovery may take several cycles. If a battery is stored for a prolonged time connected to a load, electrolyte fluid will leak, the battery will begin to deteriorate, and capacity will be impaired after storage. During long time storage battery deactivation may tend to occur, and for this reason charging may stop early during recharging after storage. This problem can be solved by charging and discharging the battery several times.

Sanyo: Generally speaking, a loss of voltage and capacity of batteries due to self-discharge during storage is unavoidable. The factors inducing this self-discharge of Nickel-Metal Hydride batteries is listed below:

The inside of the cell is a hydrogen atmosphere at low pressure, which gradually reduces the active materials at the positive electrode, resulting in a drop of cell capacity. Accompanied by this, the negative electrode which is thermodynamically unstable in its charged state gradually gives off hydrogen gas, thus reducing cell capacity.
The active materials at the positive electrode in its charged state self-decompose, causing the cell capacity to decrease.
Impurities within the cell, especially nitric ions, are reduced at the negative electrode and diffuse to the positive electrode where they are oxidized. This results in a lowered cell capacity.
The factors (2) and (3) also apply to Nickel-Cadmium Batteries. As discussed above, the self-discharge of Nickel-Metal-Hydride Batteries during storage causes a loss in stored energy. However, once recharged, this lost portion of the capacity will be almost completely restored. The self-discharge characteristics of Nickel Metal Hydride batteries is affected by storage temperature. . . If the battery is stored at high temperatures, the self-discharge will be accelerated. Also, the longer the storage period, the more the cell capacity decreases. As mentioned above, since the capacity of Nickel Metal Hydride batteries lost by self-discharge can be restored by recharging, there are virtually no noticeable adverse effects of battery storage. However, prolonged storage at high temperatures may deteriorate or deform the gasket or the separator, and should be avoided. Either fully charged or discharged, Nickel Metal Hydride ( NiMH ) batteries may be stored indefinitely. . . In either cased (charged or discharged) the capacity is recovered within two or three charge / discharge cycles.

Duracell

Ni-MH batteries can give years of safe and reliable service if they are used in accordance with recommended procedures and are not abused. Batteries should be kept clean and dry both during use and storage. They can be stored for many months in a charged or discharged state without any detrimental effects as long as they are not exposed to extreme temperatures for any long period of time. After periods during which the battery has not been used, the battery should be charged before being placed in service. Extended overcharging or overheating of the battery should always be avoided.

Panasonic

Because long term storage can accelerate battery self-discharge, and lead to the deactivation of reactants, locations where the temperature ranges between +10°C and +30°C are suitable for long term storage.

When charging for the first time after long term storage, the deactivation of reactants may lead to increased battery voltage, and decreased battery capacity. Restore such batteries to orginal performance by repeating several cycles of charging and discharging.

When storing batteries for more than one year, charge at least once a year to prevent leakage and deterioration of performancedue to self-discharging.

Nickel Cadmium

Linden: Handbook of Batteries and Fuel Cells

The sealed nickel-cadmium cell can be stored in the charged or discharged state without damage. It can be restored for service by recharging (one or two charge/discharge cycles). [Ed. note: or three charge/discharge cycles].

Panasonic

Store NiCad batteries in a dry location with low humidity, no corrosive gasses, and at temperature range of -20°C to +45°C. Storing batteries where humidity is extremely high, or where temperatures fall below -20°C or above +45°C

Because long term storage can accelerate battery self-discharge, and lead to the deactivation of reactants, locations where the temperature ranges between +10°C and +30°C are suitable for long term storage.

When storing batteries for more than one year, charge at least once a year to prevent leakage and deterioration of performancedue to self-discharging. When using a rapid voltage detection charger carry out charge and discharge at least once ever 6 months.