SARK-110 original battery model is PR-384160N or PL-403860; see datasheet at the end of this page. The basic specifications are the following: There are some vendors of Li-Ion batteries offering similar batteries. These batteries are normally supplied without a connector, so it will require the original connector being cut off and re-joined to the new battery.
3.7V 1500mAh Li-Ion PolymerThis higher capacity battery is slightly thicker than the original one, but it fits inside the SARK-110 housing.
http://www.ebay.com/itm/3-7V-1500mAh-Lipo-Polymer-li-ion-Battery-504050-for-cell-phone-Camera-GPS-PAD-PC-/111861099475 3.7V 1200mAh Li-Ion PolymerThis higher capacity battery offered by Adafruit is slightly thicker than the original one, but it fits inside the SARK-110 housing.
Note that the provided connector is not compatible; also check shipping restrictions https://www.adafruit.com/product/258 https://www.amazon.com/Battery-Packs-Lithium-Polymer-1200mAh/dp/B00J2QET64 3.7V 1000mAh Li-Ion Polymerwith JST 1.25mm PlugThis one includes the JST connector.
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