Puffy IMPRES 2 Batteries

[masstech]

We have a mix of batteries:
- IMPRES 2 size 2: PMNN4486A, datecode 17 20s, average 70 charges
- IMPRES 1 size 2: NNTN7038B, datecode 15 00s and 10s, average 90 charges
- IMPRES 1 size 3: NNTN7034B, datecode 14 40s, average 100 charges

All batteries go through IMPRES 2 multi unit chargers. Radios are take home, and most homes have IMPRES 2 chargers, although there are some IMPRES chargers that have not been swapped yet.

Radios are not put into chargers usually. Charged batteries are always ready to go from a home charger or multi unit charger, and are swapped from charger to battery and drained batteries placed back.

We noticed IMPRES 2 batteries were getting a little harder to insert into radios. Looking closer, we notice slight puffiness in the center of the battery, where the label is.

We measure on average from 1/32" to 1/16" of puffiness on IMPRES 2 batteries with a digital height gauge.

We measure on average at most 1/32" of bulging on IMPRES batteries. Size 3 IMPRES batteries remain flat.

Is anyone else experiencing this?

 

[N4KVE]

Have you put these batteries on an analyzer? While I have not experienced this with M Impres batteries, I have with another radio brand's batteries, & it meant it was time for the trash. Analyze them.

 

[masstech]

The IMPRES 2 batteries have been in use for only a few months now, and they are puffier than the older IMPRES 1 batteries (3 years old now).

The multi unit charger reports all of them fine.