D4 Battery Case?

[kenji91]

Does anyone know if they make a case with a built in battery so extend use?

Something like this for the iPhone, but for the Droid 4...

PhoneSuit Elite Battery Case for iPhone 4, iPhone 4S

[AMTrombley0924]

I haven't seen any.

If the trend of non-removable batteries sticks around, its certainly a market that should be tapped, seeing as the iPhone has gotten it. I guess how popular/successful the iPhone ones are will determine if making them for more phones will be worth making. I'd definitely buy one for the D4 if they sold one. Beats carrying around an external battery.

[kenji91]

I haven't seen any.

If the trend of non-removable batteries sticks around, its certainly a market that should be tapped, seeing as the iPhone has gotten it. I guess how popular/successful the iPhone ones are will determine if making them for more phones will be worth making. I'd definitely buy one for the D4 if they sold one. Beats carrying around an external battery.

I suppose that's the problem... there just might not be enough D4 users to warrant building one. iPhone 4/4S's vs D4 - what do you think the ratio of ownership is?

[Benton]

Just thinking aloud ... the inductive charging system(s) available now use a phone back cover that places a charge into the battery via open contacts on the phone body adjacent to the battery. Could a back cover be made that had its own battery built into it that also used these contacts to increase the current battery capacity (two batteries on the phone)? I am not sure of the internal charging circuitry of the D4 but it would seem adding a battery to these internal contacts would essentially be the same as paralleling two batteries to the same load.

[gossipninja]

Just thinking aloud ... the inductive charging system(s) available now use a phone back cover that places a charge into the battery via open contacts on the phone body adjacent to the battery. Could a back cover be made that had its own battery built into it that also used these contacts to increase the current battery capacity (two batteries on the phone)? I am not sure of the internal charging circuitry of the D4 but it would seem adding a battery to these internal contacts would essentially be the same as paralleling two batteries to the same load.

that makes sense, the issue is the market for d4 specific items is so small I don't think anyone is gonna make a new backcover with battery.

If you could find the polarities, etc of the 4 pins, you could repurpose an inductive cover and a battery cell (and duct tape) and fashion a crude prove of concept.

[davidgro]

...
If you could find the polarities, etc of the 4 pins, you could repurpose an inductive cover and a battery cell (and duct tape) and fashion a crude prove of concept.

Perhaps someone who bought an inductive cover could just use a multimeter on the cover's pads when it (not attached to a phone) is on the charger and tell us the pinout.

[orange93]

I haven't seen any.

If the trend of non-removable batteries sticks around, its certainly a market that should be tapped, seeing as the iPhone has gotten it. I guess how popular/successful the iPhone ones are will determine if making them for more phones will be worth making. I'd definitely buy one for the D4 if they sold one. Beats carrying around an external battery.

I want and inductive battery for the D4, i haven't been able to fine one? i just have the extended battery, its 4000mah and came with the door, it was $16.00, i thought it was a pretty good price, however an inductive battery seems like a great idea, i agree its a great market.

Amazon.com: droid

[podspi]

I want and inductive battery for the D4, i haven't been able to fine one? i just have the extended battery, its 4000mah and came with the door, it was $16.00, i thought it was a pretty good price, however an inductive battery seems like a great idea, i agree its a great market.

Amazon.com: droid

That's for the BIONIC, not the D4. But something like that would be nice. Sadly I don't have a multimeter, but if I ever pick one up I will get the pin-out, since I've been thinking about something similar.

[kenji91]

That's for the BIONIC, not the D4. But something like that would be nice. Sadly I don't have a multimeter, but if I ever pick one up I will get the pin-out, since I've been thinking about something similar.

Sadly I have the multimeter, but not the inductive cover. :/

[gossipninja]

Sadly I have the multimeter, but not the inductive cover. :/

the pins should correspond to these, I have both a multimeter and the inductive cover, i just dont know how I would go about finding out which pins are battery temp and battery size.

• GND - Ground
• BSI - Battery Size Indicator
• BTemp - Battery temperature
• VBAT+ - Battery positive terminal