Most helpful critical review
15 of 17 people found the following review helpful
Exploded while charging
on April 27, 2012
These are not good batteries. I bought 4 of these a couple of years back. Recently, two of these 4 stopped accepting a charge. My charger [Tenergy T-3969A1] won't even recognize them when inserted into the charger [charging light wont come on]. I researched into this issue on the `net and found out that sometimes the batteries get an open cell. I have not tried the revive methods suggested by some people on those two batteries.
At that point I suspected that the charger went bad so I bought a Maha Powerex MH-C490F Stealth charger. That charger also refused to charge the two bad batteries.
However when I tried to charge the other two batteries... both exploded after about an hour of charging. I suspected that the batteries cannot handle the fast charging action of the Maha MH-C490F charger. Did some research again... found out that the Maha Stealth is rated for 70-90mA. For comparison, I looked at Tenergy's own 9v charger - TN141. That is rated for 100mA. Also on Tenergy's own website says "Can be rapidly charged with our chargers model TN141, TN136, TN137, BC1HU, V1199B, V3969A1, V228. "
Hence it was definitely a bad battery and not the charger which caused these batteries to explode
OR, although these are listed to be capable of rapid charged, in reality, these batteries cannot be rapidly charged. These can be charged only by those old style chargers which put out only 15-16mA like the Tenergy T-228 or T-3969A1.
The 2 batteries did NOT explode spectacularly; they cracked and the tops popped out. After looking closely I could see that 2-3 of the 8 internal cells had swelled up and leaking fluid.