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i'm constructing a simple portable speaker/amplifier and want it to contain am integrated rechargeable power source.

What's the best/safest way to integrate a rechargeable battery?

i want it to work much like an electric shaver or mobile phone would, with a transformer integrated into the plug, and with a coaxial power connector used to transfer electricity to the unit.

thanks.

battery type: probably ni-mh i think? i need something with plenty of ampere-hours, but am concerned about making it safe enough to leave charging overnight. also i need a simple and cheap solution!

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  • \$\begingroup\$ Battery Type? As different batteries need different charging methods. Such as Ni-Cad and NiMH can be charged with a constant current source. \$\endgroup\$
    – Dean
    Commented May 22, 2011 at 11:25
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    \$\begingroup\$ thanks for the response - have amended the question and am now researching constant current source! \$\endgroup\$ Commented May 22, 2011 at 11:44

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Your best bet is to use a battery management IC. Searching Digikey for "Battery management" and then filtering by battery chemistry and then price, gave me the TSM101/A. For less than a dollar, it seems to be capable of what you want.

Just replace the mains and rectifier portion of the circuit with a wall wart. There are some examples with charge status LEDs.

Here is the data sheet.

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