I have a 4V 1.5A battery using it for led lights. What time it will take to charge full? Or on what factor this charging time depends? And how to calculate this
6
-
\$\begingroup\$ The permissible charging rate for a battery depends on the battery chemistry and construction. Some battery types can tolerate much faster charging than others. \$\endgroup\$– Peter BennettCommented Dec 27, 2015 at 17:59
-
\$\begingroup\$ You said '1.5 A'. Do you mean 1.5 Ah? It should be on the battery label. If so then edit your question. Units matter. \$\endgroup\$– TransistorCommented Dec 27, 2015 at 18:03
-
\$\begingroup\$ No.. Its 4V 1.5A only \$\endgroup\$– user83853Commented Dec 27, 2015 at 18:04
-
\$\begingroup\$ Do you know what kind of battery it is, or where it came from? Is it NiMh, NiCd, lithium? Your question will end up getting closed if you don't provide more information. It is rare to find a rechargeable battery which does not include a capacity in units of Ah or mAh. Please check carefully. \$\endgroup\$– user57037Commented Dec 27, 2015 at 18:14
-
\$\begingroup\$ What does the supplier recommend? \$\endgroup\$– Andy akaCommented Dec 27, 2015 at 18:22
|
Show 1 more comment
1 Answer
\$\begingroup\$
\$\endgroup\$
Batteries are usually rated in Ampere hours (Ah), which is Amps x hours. So 1Ah could be 1Amp for 1 hour, or 2A for 0.5 hours, or 0.5A for 2 hours etc.
If you have a 1.5Ah battery and charge it at 1A then it should take 1.5 hours to fully charge from empty. However, depending on the battery's chemistry it may have to be charged at a lower rate, and current may have to be reduced once the voltage rises to its maximum permitted value.
Before deciding how to charge your battery you need to know what type of chemistry it uses. This may not be written on it, but you can get a clue from the rated voltage and physical shape. 4V suggests a 2 cell Lead Acid battery, because Lead-acid chemistry develops 2V per cell. However this an unusual configuration (6V and 12V are much more common), so it might be something else such as a single Li-ion cell (which is 4.1~4.2V fully charged).
If you charge a battery incorrectly it may catch fire or explode, so it is vitally important to know what its charging requirements are. If you aren't sure then don't do it!
answered Dec 28, 2015 at 1:03