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XPR NNTN8128

K2NEC

Member
Joined
Oct 23, 2017
Messages
1,184
Hey all

I recently got a few NNTN8128 batteries with the intention of using them with my XPR7550e. Charged a few up and put them in my radio only to find the "Unknown battery" error. I know that these are meant for the APX1/2/4000 but shouldn't they work with the 7550e too since they use the same contacts? The batteries themselves seem to work ok besides being a little old but they just won't display the battery life in them. Anyone have any insight to this?

Thanks
 

737mech

Member
Premium Subscriber
Joined
Aug 14, 2006
Messages
1,946
Location
Clark County, NV.
Where did you buy them? Authentic? There are many sellers online saying they will work with XPR and they do but they don't have the chip for Impress. I learned this on two ebay buys.
 

K2NEC

Member
Joined
Oct 23, 2017
Messages
1,184
Where did you buy them?
Ebay
Authentic?
Yep 100% legit.
There are many sellers online saying they will work with XPR and they do but they don't have the chip for Impress. I learned this on two ebay buys.
They went through a recondition cycle so methinks they are fine.
Motorola lists those batteries as officially for the APX radios which makes me think there is something inside the battery that the radio detects and it's just like "nope I don't want to work"

EDIT: I should mention these are batteries that have been decommissioned so they obviously worked fine at one point.
 

K2NEC

Member
Joined
Oct 23, 2017
Messages
1,184
Maybe so APX vs XPR?
Since they don't work right with my 7550e I would probably sell the ones that work. But I don't have an APX4000 to confirm that they work or what their service life is unfortunately. When I get to testing all of them out I'll see if it's all of them with the same problem or just coincidentally the ones I tested.
 
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