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Where can I get good battery for M7?


tuanvo1982

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Any hardware store or electronics shop should have LR44s, you need four of them. I can get them in groceies stores here. The CR1/3Ns (of which you need two) may be harder to find. Amazon is probably as good a place as any. Regardless of what you choose, find a source that has fresh batteries.

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I prefer to buy in-person so I can check expiry dates or lot numbers so that they are fresh and probably of the same batch. A gentleman here (I think) reminded me that testing for voltage alone is insufficient.

 

For the experts - an experience and a question. Long ago I put a pair of AAA batteries in a remote control device and it caught fire. My guess is that one of the batteries was near dead and the other fresh. Can that happen with our M7, M9 batteries?

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I buy mine (Energizer DL1/3N) from BatteryJunction.com. I'm sure other sites would be suitable too. Expiration dates are many years from now, so I'm not too worried about that. Two are used at a time. If you buy 5+ or so, you get a price break, and they come out to about $3/battery.

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I prefer to buy in-person so I can check expiry dates or lot numbers so that they are fresh and probably of the same batch. A gentleman here (I think) reminded me that testing for voltage alone is insufficient.

 

For the experts - an experience and a question. Long ago I put a pair of AAA batteries in a remote control device and it caught fire. My guess is that one of the batteries was near dead and the other fresh. Can that happen with our M7, M9 batteries?

 

I suggest we should turn camera off first then change batteries :)

Remote control device normally doesn't have on/off functionality.

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I prefer to buy in-person so I can check expiry dates or lot numbers so that they are fresh and probably of the same batch. A gentleman here (I think) reminded me that testing for voltage alone is insufficient.

 

For the experts - an experience and a question. Long ago I put a pair of AAA batteries in a remote control device and it caught fire. My guess is that one of the batteries was near dead and the other fresh. Can that happen with our M7, M9 batteries?

 

More than likely an electrolytic capacitor in the power supply circuit let go. Probably unrelated to having one dead cell. Still, electronics is all about keeping the smoke 'in". :D

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