extremely long lasting batteries

Hello I’ve been looking for extremely long lasting batteries as my current a simple 9v battery will not last long enough. Does anyone know of a really long lasting battery pack? Or what about stacking 9v batteries ? Has anyone tried stacking 9v’s ? Any help will be greatly appreciated Thanks

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xtender (author) 11 years ago
Awesome you guys just help me out a bunch their with that. Not only is that interesting but very cool. I would have like to know that before as batteries do cost so much. Anyway I’m going another route now I think. This device also has a 12V DC plug. What do you think of simply taking the plug and splicing it and connecting it to a few of those super power 9v’s ??? I think it’d work very well as this device probably has a power converter if it takes batteries and an ac adapter for different voltages. (right?) As soon as I finish this project I’ll post it ;) Thanks for all the help
xtender (author) 11 years ago
Okay well from my research the thing I’m modifying has a voltage converter, so I think that should be fine.

Now I’ve been looking around on the internet for the most powerful rechargeable 9v’s I can find. But unfortunately all the rechargeable ones I find are pretty weak.

I have found this disposable one though that are very strong:


Anyone know of an extremely powerful rechargeable one?
I am pretty sure you can recharge normal alkaline batteries..
mark10111 years ago
I agree with westfw six 1.5 batteries in series. otherwise look at whats sucking up all the power in your device can you modify it? or convert to AC to DC tranformer with messy wires are wires bad? is size a consideration?
I don't know about the 9v, but I have heard that all rechargeable batteries quit after so many recharges, set by the factory. Is that true and is there a way around that?
It's not set by the factory ;) Rechargeable batteries wear out over time and use.
xtender (author) 11 years ago
Thank you very much for the explanations . Okay so this is my idea. The items I’m modifying have: Battery Type: Quick Swap 3.7 V/ 1.8 Amp Lithium and 7.6V 1800 mAh rechargeable Li-ion battery My idea was to take out the batteries inside the unites then find the polar metal attachments and solder a 9v battery clip and string them till it gives me enough power. Would this work out well?? Also is anyone know of a tutorial that would should how to string up 9v batteries I’d be very appreciative. Thanks again for all your help
stone3408 xtender11 years ago
I've tried with some sony info lithium types. Cracked three, no dice on any of them. If some one knows please share.
I don't know what devices those are... but you could cause problems putting 9V to it because it only takes 3.7 and 7.6 volts. Also -- re-read westfw's post ;) A 9V battery has a capacity of about 500mAh -- the batteries you're replacing have over double that. So IF the device does not "fry" from putting 9V to it -- it won't stay on as long as the original battery. It kinda sounds like a cell phone (mine uses a 3.7V battery). You may have problems if the device tries to recharge the 9v battery. Rechargeable Li-on batteries also have more than just two connections to the device (usually a temperature sensor).
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