@SpiDybot
If you have your your ws65 sensor on a high pole ( and it does not receive enough light to recharge his supercap ) you may find the
battery extension handy ( don't know if available trough froggit )
The ws65 sensor does not recharge the AA batteries inserted ( it recharges an internal supercap ). The aa batteries are a backup in case ( as in your case ) there is not enough sun.
For the ws65 sensor you can use any aa battery you want, rechargeable or not, but every battery has his own pro and cons:
- alcaline battery, known to leak, do not perform well in cold climate, cheap, not rechargeable
- lithium, do not leak, perform well in cold, high capacity, expensive, not rechargeable
- NiMh, do not leak, do not perfororm well in cold climate, low self-discharge, rechargeable, low nominal voltage ( they perform reasonably well in my ws65, but in Italy we have higher temperatures and sunlight so YMMV )
- NiZn, don't know much about them but are used when high current for short time is needed, high self discharge, high nominal voltage ( don't think these are the right choice for ws65 )