Can i reacharge AA batteries using a 4V 250mA solar panel?
Question:
Answer:
Rechargeable batteries like AA's are typically 1.25 volts instead of the normal 1.5 for an alkaline equivalent.
You could charge 3 AA's (3.75V) in series but you probably don't want to charge them as fast as the 250mA is going to. Typically you use 1/10 of the amp hour rating for the battery in mA.
Your 4V will vary aswell depending on how much light there is, and you could use that to your advantage if you have a volt meter handy. Angle the panel until you get the 3.75 volts.
Amp-Hour battery rating: This is a common rating of batteries. Amp-hour rating of battery capacity is calculated by multiplying the current (in amperes) by time (in hours) the current is drawn.
For example: A battery which delivers 2 amperes for 20 hours would have a 40 amp-hour battery rating (2 * 20= 40).
Battery Type Capacity (mAh) Typical Drain (mA)
D 12000 mAh
C 6000 mAh
AA 2000 mAh
AAA 1000 mAh
N 650 mAh
9 Volt 500 mAh
6 Volt Lantern 11000 mAh
To determine the battery life, divide the capacity by the actual load current to get the hours of life. A circuit that draws 10 ma powered by a 9 volt rectangular battery will operate about 50 hours: 500 mAh /10 mA = 50 hours
250mA will reduce the life of the batteries, but it will work if your in a bind, but not recommended. 20mA each is about what a AA needs, but it will vary slightly. Your method will charge them very quickly, and they will get hot.
If you were stranded on an island your McGuiver method would be sufficient to get you off.
You can, but only once before they start to leak...and only charge them for like 10-15 min. Keeping batteries in the freezer helps preserve their juice.
yeah u can...
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No, for several reasons.
1. The 4V is too high for AA batteries.
2. If these are standard alkaline batteries, it's not recommended to charge them because they can leak acid if done improperly.
3. It's of little to no use to recharge standard alkalines if they have been completely discharged. (This is determined by details of the battery's chemistry, which is different for different battery types.)
4. There is nothing to prevent overcharging once the battery has become fully charged.
It's best to use batteries that are expressely meant for recharging, like NiMH, or ones that say "rechargeable alkaline".
You could buy a charger meant for the type of battery you have. If you want to go the do-it-yourself route, then I would do a search at www.google.com to get specific requirements.
Hope this helps.
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