Great! ....
But, the problem you are going to have with the cellphone batteries is that they are lithium-ion. These require a "very" special charger. Often the charger circuit is in the cellphone, not in the wall wart.
But after a quick Googel: https://www.amazon.com/s/?ie=UTF8&keywords=bt51+charger&tag=googhydr-20&index=aps&hvadid=14584877395&hvpos=1t1&hvexid=&hvnetw=g&hvrand=203986430945789132&hvpone=&hvptwo=&hvqmt=e&ref=pd_sl_3kpnb3y24r_e
Ken
But, the problem you are going to have with the cellphone batteries is that they are lithium-ion. These require a "very" special charger. Often the charger circuit is in the cellphone, not in the wall wart.
But after a quick Googel: https://www.amazon.com/s/?ie=UTF8&keywords=bt51+charger&tag=googhydr-20&index=aps&hvadid=14584877395&hvpos=1t1&hvexid=&hvnetw=g&hvrand=203986430945789132&hvpone=&hvptwo=&hvqmt=e&ref=pd_sl_3kpnb3y24r_e
Ken
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