--- /dev/null
+[appendix]
+== Handling Precautions
+
+ All Altus Metrum products are sophisticated electronic devices.
+ When handled gently and properly installed in an air-frame, they
+ will deliver impressive results. However, as with all electronic
+ devices, there are some precautions you must take.
+
+ The Lithium Polymer rechargeable batteries have an
+ extraordinary power density. This is great because we can fly with
+ much less battery mass than if we used alkaline batteries or previous
+ generation rechargeable batteries... but if they are punctured
+ or their leads are allowed to short, they can and will release their
+ energy very rapidly!
+ Thus we recommend that you take some care when handling our batteries
+ and consider giving them some extra protection in your air-frame. We
+ often wrap them in suitable scraps of closed-cell packing foam before
+ strapping them down, for example.
+
+ The barometric sensors used on all of our flight computers are
+ sensitive to sunlight. In normal mounting situations, the baro sensor
+ and all of the other surface mount components
+ are “down” towards whatever the underlying mounting surface is, so
+ this is not normally a problem. Please consider this when designing an
+ installation in an air-frame with a see-through plastic payload bay. It
+ is particularly important to
+ consider this with TeleMini v1.0, both because the baro sensor is on the
+ “top” of the board, and because many model rockets with payload bays
+ use clear plastic for the payload bay! Replacing these with an opaque
+ cardboard tube, painting them, or wrapping them with a layer of masking
+ tape are all reasonable approaches to keep the sensor out of direct
+ sunlight.
+
+ The barometric sensor sampling port must be able to “breathe”,
+ both by not being covered by foam or tape or other materials that might
+ directly block the hole on the top of the sensor, and also by having a
+ suitable static vent to outside air.
+
+ As with all other rocketry electronics, Altus Metrum altimeters must
+ be protected from exposure to corrosive motor exhaust and ejection
+ charge gasses.
+