Avantree BL-5B Rechargeable Li-ion Battery (3.7V 650mAh) - for use with 10BS, 10BP and CK-11

I got this to replace the original BL-5B battery on my Rii i4 keyboard which, over the span of about 2 years, had gotten so progressively fat and swollen, that it could not even fit inside the battery compartment anymore. I couldn't even snap the battery cover back on, it was that swollen. I was afraid if I was to use it any longer that it would have exploded or something.But anyway, this new BL-5B fits in the keyboard like a well fitted glove and it works just fine. Hopefully it won't suffer the fate of the original battery, but we'll see. For now, I am happy.

It works great.

good product

This battery replaced the original as an OEM and fit in perfect. Charged it up and haven't had any problems so far, but also can't say yet how long it'll last before needing recharged. So far, so good.

Lasted about 1/3 as long as high quality batteries. I've found that most of the brands sold everywhere (ie Ebay) have the same issue. If you can buy from your devices manufacture its worth the effort and cash...

it's important to have a couple of extras, already charged and ready to switch out for the one that's drained, in your camera (because they take several hours to recharge; and, you can't wait for a recharge in the middle of your shoot). just make sure you're buying the same "amperage/volts/energy output" as the one that came with your device and that it has the same metal conductor configuration on the side.

not in use long enough to evaluate longevity..

It's cheap and didn't last long at all