La Crosse Technology Battery Charger Instruction Manual page 8

What type of batteries can I charge?
NiMH (Nickel Metal Hydride) or NiCd (Nickel Cadium) rechargeable batteries
only may be used in this product. Charging other types of batteries may result
in failure of the charger.
My battery reads "Null".
This charger requires at least .9v in the battery in order to charge it. If the
battery is depleted below that point, you will not be able to charge it on this
battery charger.
You may want to invest in a small charger/holder that will bring the battery back
above .9v when attached for 20-30 seconds. The battery can then be charged
in our charger.
Why do my new batteries not show full capacity?
Due to storage and shipping times, you should charge your batteries fresh out
of the package. All rechargeable batteries need to be used in a product "under
load", then charged, used, charged, at least 5 times or more to reach full
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capacity. Batteries sitting in storage may lose some charge over time.
It is not recommended to "condition" batteries until after they have bee charged
and used 10 times.
As you use your batteries they will gain greater capacity and last longer. It is
common for your batteries to run down quickly at first.
Storing batteries
Store between 40 and 80 degrees F. Do not refrigerate.
Batteries will self-discharge if left unused. If unused for 30-60 days they may
completely deplete of power after long storage.
NiMh batteries should be stored fully charged and recharged every 30 days to
keep in peak capacity.
NiCd batteries should be stored fully discharged.
Do not "store" batteries in the charger.
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