HQRP Battery 80mAh compatible with Sennheiser BA151 BA150 BA152 / 4146 fits RS40, RS45, RS400, RR820, RR2500, HDR60, HDR65, HDR80, HDR85, A200, HDI302, IS150, IS300, IS380, RI150, RI300, RI500, RI810, RS30, RS60, RS65, Set250, Set810 Headphones / Receiver

It is to soon to evaluate the effectiveness, efficiency and reliability of this product, having just acquired it, and used it only once. Ask me again after I have used and re-used, charged out and re-charged, regularly checked the springiness of the terminal contact tabs, regularly checked the anti-corrosion robustness of the terminals, measured its 'life-lasting' amperage per single usage, and measured the potential voltage output of this product each time after being freshly charged ... And when I will have done all that at least a 100 times (over about five years' extended period of time), I shall be better able to ascertain whether my money was well spent, and whether this product really stands up over a prolonged usage to supply a regular, constant and reliable current supply to my headset equipment, as it should. Any comment on the true usefulness of this product - made before then - would be a premature, unwise, unqualified, untested, unproven and meaningless empty words.

I bought these batteries to replace my old Sennheiser batteries. I had previously tried cheaper ones but after couple of charges they were barely lasting 20 minutes. I've tested these HQRP ones and with sound at full blast they seem to last about 180 minutes so am much happier

After a few months use, the battery output is still significantly greater than the original batteries and they hold the charge well. They are a beautiful fit in the headphones and the charging unit and I can thoroughly recommend them as a low cost replacement providing longer playing time.

I've just come back to using these headphones and recently charged the battery. It lasted about 1 hour then died. On the second charge it lasted about 10mins. I'm going to charge it one more time then probably throw it in the bin. Can't find a decent version of this battery model anywhere? Avoid at all costs.

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Replacement batteries arrived within 3 days. Both charge o/k .I do suggest that you purchase 2 batteries as even the original would only hold its charge for 180 minutes with the headphones

I have used this battery with complete satisfaction before. Just as good as the SENNHEISER battery and much cheaper. Need I say more?

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