Update batteryInfo.md

docs/api/system/batteryInfo.md

 #### 电量
 
-仅微信小程序平台支持，[规范详情](https://developers.weixin.qq.com/miniprogram/dev/api/wx.getBatteryInfoSync.html)
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+电量API暂未统一，需分平台条件编译编写。
+
+- 微信小程序平台：[规范详情](https://developers.weixin.qq.com/miniprogram/dev/api/wx.getBatteryInfoSync.html)
+- 百度小程序平台：[规范详情](https://smartprogram.baidu.com/docs/develop/api/device_battery/#swan-getBatteryInfo/)
+- 支付宝小程序平台：[规范详情](https://docs.alipay.com/mini/api/nrnziy)
+- QQ小程序平台：[规范详情](https://q.qq.com/wiki/develop/miniprogram/API/equipment/ibeacon_battery.html)