To protect your remote control unit, i would recommend
- cover it with plastic bag or 佳能保鮮紙 to protect against accidental water damage
- never drop it (try your best)
- use high quality batteries
For non-rechargeable battery, I do NOT recommend GP coz the problem of 漏電池水 is quite serious. For rechargeable battery, sanyo/panasonic eneloop is quite good.