Data Hacking

44 Part I — Hardware Hacks
FIGURE 3-3: NiMH rechargeable batteries
Compared to other types of batteries, rechargeables have a good lifespan in use, and can be
recharged repeatedly. They’re environmentally friendly, and you can recharge them while you’re
on the move, using in-car chargers or solar chargers.
Some drawbacks to rechargeable batteries are that they are not widely available and they are
very costly. They generally have a shorter life than alkaline batteries, and they don’t handle cold
weather as well as alkaline or lithium batteries. They also require recharging before first use,
which can be inconvenient. Finally, some rechargeable batteries can be slightly smaller (in
length) than alkaline batteries, which can make the device cut out if subjected to shock or
vibration.
You should be sure to get two chargers. Get a fast charger for when you want batteries in a
hurry (see Figure 3-4), and get a slower charger that you can use occasionally to recharge and
recondition your batteries. Alternating between a fast charger and a slow charger is good for
battery health and will guarantee you the best performance and lifespan from your batteries.
Make sure that your charger matches your batteries. Never use a charger that’s not designed
for the batteries you are charging.